UV Impact on Colored Patinas On Bronze

Arguably, from a door handle perspective, Florida can be one of the most demanding climates. The state is a peninsula surrounded by sea water and its latitude yields many days of sunshine and not surprisingly is home to many of our clients.

UV Impact on Bronze

When we hot patina a door or cabinet pull we heat the bronze with a torch and apply successive coats of pigment suspended in water to the metal surface which absorbs the pigment left after the water  evaporates. The patina absorbs UV and this leads to a chemical change that breakdowns the bonds between the pigment molecules making the color appear less vibrant. The lizard levers below will fade over time with UV exposure so what are the options?

Photo of lizards at patina stage before sealant applied. Photo courtesy of the photographer Maria Ramirez-Adams.

 How to lessen UV impact

Clear polyurethane resin and polyester offer 2 different ways of sealing and protecting the color.

Polyurethane acts as a UV blocker and as a resistant physical barrier that shields the color beneath. It blocks the UV by absorbing, deflecting and scattering the UV away from the metal surface thereby slowing chemical changes in the patina.

Clear polyurethane resin also creates a physical barrier that shields the layers beneath from UV and also from salt and environmental contaminants that can degrade the patina. The resin is typically sprayed onto the surface and air dried rather than baked.

 Polyester versus powder coat

Polyester is also an excellent sealant for protecting metal from UV and salt and environmental degradants. The practical difference lies in how they are applied and cured.  Polyester is applied as a powder using an electrostatic process. The piece to be coated is attached to a copper frame or rod which negativley charges it. The applicator, which is like a spray gun is positively charged and when fired the gun sprays powder onto the surface of the object. In simple terms think of physics 101 when a magnet is used to attract iron filings. The powder bonds to the surface of the object. To make the bond more permanent the coated object is baked  to a temperature of 350 to 400 degrees for at 10+ minutes. With polyurethane the finish cures over a longer period often taking 5 to 7 days to complete. The Geckos shown here were both hot patinaed with a green pigmented solution but the top gecko was first dipped in a cold dark solution and then both were coated with polyester and baked. Polyester makes the pieces a little plastic in appearance but it does offer a resilient seal that will last for years.

Patinas For Hardware and Sculpture

In previous pieces we have covered  our standard light and dark antique patinas. For custom orders we also offer a hot patina, which is applied to pre-heated bronze. We limit these finishes to just a  few pieces, that include the  small butterfly pull, which can be special ordered in amber- yellow; the frog knob, which can be ordered in a blue green, and the lizard lever or knob which we can patina pea green.

Sandblasted brushed - patina ready Cold antique bronze patina Pea-green hot patina

With our new bronze sculptures, we are developing patinas made with ferric nitrate as well as liver- of sulphur. Ferric Nitrate is a chemical compound of iron powder, nitric acid and it produces a  rust red patina. Liver-of-sulphur  is a chemical compound of powdered sulphur, sodium, and water. They are applied to the sculpture with a spray bottle or brush and the sculpture is preheated to a temperature of approximately 100°to 200°depending on the chemical and dilution. As the sculpture is hot, the wet patina attaches to the surface and the moisture evaporates quickly leaving behind a layer of color.

The colors these patinas produce on bronze can vary from gold to brown to red to dark red to black, depending on how hot the piece is, and how many coats are applied. The chemicals below can be mixed and diluted to produce a wide range of hues. They can also be applied over each other provided the previous patina has sufficiently dried. By layering the patinas and by using brushes and different spraying methods it is possible to develop deep mottled colors and effects. It has taken a lot of practice and years of trial and error to create the look we are seeking for each sculpture.

1. Scotch bright surface 2. Sulphur dioxide spray mist onto surface 3. Diluted bismuth white splatter spot spray

4. Ferric nitrate fine spray cover surface fine coating. 5. When dry wax

Words of caution to anyone thinking of learning how to patina bronze, exercise caution and a generous helping of common sense. The patinas we use are applied in a very well ventilated area and masks and gloves and protective aprons are a must. We also exercise considerable caution when heating up bronze as temperatures above 100° can burn exposed skin.

Liver of sulfur – yellow brown to black tones

Ferric nitrate – red tones

Ferric chloride – darker red tones 

Bismuth nitrate and titanium dioxide – white

Cupric chloride  – pea green or apple green

Cupric nitrate – blue green

A very good site for reading more about patinas and for practical advise on formulas can be found at David B. Bowman an artist in the San Francisco Bay Area.

Beetles in the fictional world of Martin Pierce

A lesser-known area of Martin Pierce’s work is the fictional world occupied by insect and humanoid bronze creatures. To better show these sculptures we are adding new pages to our site and will be creating a new collection page and eventually a payment portal.

Since childhood Martin has been  fascinated by  insects and birds and not just by their obvious beauty but by their ingenuity and dexterity. Wasps, butterflies, moths, and swallows are represented in our company’s door hardware and cabinet hardware collections. However, the scale of  door hardware as well as the functional limitations relegate these forms to incidental turn pieces, thumb latches or cabinet pieces. 

As Martin’s art work is not subject to the same restraints he is using this new freedom to re-imagine both the scale of humans to insects as well as their functional and social relationships.

In December 2021 Martin sourced a deceased aqua blue horned rhinoceros dung beetle from a New Mexico  entomologist. Known affectionately to friends  as Phanaeus Pilatei this particular insect is beautifully colored and powerfully built. The powerful front plate and horn is used as a soil digger that is as proportionately powerful as a bob-cat shovel or bulldozer blade.  Alas, the beauty and mechanical dexterity of Phanaeus is rarely appreciated due to his diminutive size. In Martin’s sculptures and paintings he hopes to shine a light on these undervalued scarabs by portraying then as larger than life and by developing a story that he hopes will be captivating.

True size of Dung beetle 3/4”L x 1/2”H New Model for Dung Sculpture 10”L x 6”H Other Beetle Sculptures

A Swarm of Bees Inspires a Collage of Bee Knobs

This has been the most remarkable spring but the arrival of a swarm of bees was as unexpected as it was spectacular. On Sunday we heard loud buzzing from our front garden and spent the next hour watching the process of hundreds of bees settling in our Brazilian Pepper Tree. What began as a few bees over the next hour became a mass all huddling together to protect the queen. By evening the swarm had settled in and become calm as the temperature cooled and their rest time commenced.

While we knew that the Queen was at the center of this colony, we did not fully understand why this event had occurred so turned to the internet. The queen increases the size of the colony by laying eggs that become worker bees and so the colony grows until it eventually it out-grows the hive at which point the queen lays a few queen eggs. The queen then leaves the hive before the new queen bee hatches and takes with her about half of the worker bees to journey onwards to begin a new hive. We were lucky spectators at the point where the queen and her followers had set out in search of a suitable location for their new home and had decided to rest over-night in our tree. At no point did the swarm pose any threat to us as we passively looked on from a safe distance remaining still save for the photos we took.

The following morning the queen and her entourage waited to be warmed by the sun before continuing on their quest.

I was inspired by the sight of these live bees to create a playful collage using our polished bee door knob with a back-drop of dark honeycomb roses which is the most well-known handle set from our Netsuke collection of animal door handles.

Bunny, Bee and Frog Door Knobs - animal door knobs

Whimsical pairings for a magician - this may sound like the title to a children’s novel but in the context of door hardware perfectly describes an order we have just completed for James Shafer’s magical solutions store opening soon in Columbus, Ohio. A full description of this enchanting enterprise can be found at;

https://www.hierophanyandhedge.com/

As befits a magician, James strayed from the path of “sameness” and instead conjured up a fun set of door handles using the animal knobs from our netsuke collection and the swirling leaf escutcheon plates from our willow collection. The results were beautiful and whimsical and could well have been illustrations for a children’s book.

Bunny knob dark oil rubbed patina

The sets were cast in solid bronze and finished with a dark antique oil-rubbed patina. Each piece was burnished by hand to highlight the bronze tones of the raised sections making the leaf veins and wing and ear details more pronounced and creating a sense of depth through the contrasting light and dark areas.

Burnishing the wing veins to accentuate the golden bronze beneath

We have mixed  and matched  our door styles for other clients and readers will recall the willow knob being used as an entry set with a medium bark back-plate in a very creative residential remodel by Los Angeles Designer Bonnie Mcintyre.

Tiger Illuminated Door Handle

Tiger Design for Illuminated Door Handle latest piece from Martin Pierce

The new Tiger Illuminated Door Handle has now been released into the wild or at least that is how we sometimes feel about the internet.  We have in previous posts explained how the pattern was created with old world skills using a scroll saw and aluminum sheet to create a durable pattern for lost wax casting. We have now completed  our first stainless steel castings and using energy efficient LED strip lights have created a color changing and single color illuminated Tiger door handle.

As is the case with all of  illuminated door pulls, the Tiger panel is  directly wired  with 22 gauge fine wires that are fed through the door frame into the decorative door panel.  The power is typically delivered to the door through an electric hinge and then conveyed to the handle through a low gauge harness that comes with the fixture and is ready for connection to a class 2 power supply.  

The Tiger door pull is UL listed and is lit with a flexible weatherproof strip  and encased in stainless steel which is corrosion resistant and durable.

Tiger is the fourth  piece in our collection of  illuminated door handles which include  Fish, Coral, and Morphic themes.

Work is continuing on the Hedgerow new tree handles  but as with any new design of this size and complexity there have been quite a few challenges to resolve and as we are now incorporating LED lights and have a left and right facing handle we have had a lot to think through.

Other illuminated designs are taking shape in Martin’s sketch book so stay in touch to see these as they evolve.

Colorful Door Hardware - How to Use Hot Patinas

Nature is a strong and continuous source of inspiration for our door handles and cabinet pulls so I wanted to complete this series of posts with a few pictures that illustrate this as well as providing information on how our yellow and maroon color patinas are made.

The dragonfly cabinet pull is an example of a hot chemical patina created with Sculpt Nouveau’s red and yellow dye oxide that are mixed together to create a maroon color.

To create the yellow amber tones of the butterfly we use a yellow and white dye oxide which we apply to the heated butterfly and once the desired color has been reached and after the pull has cooled down we apply small black wing markings with a  fine paint brush and a cold patina M20 product  by Birchwood Technologies.

Animal Cabinet Knobs and Pulls

The process for all of our hot patina finishes is the same;

Buff the bronze pull by hand or by using a buffing wheel buffing wheel and buffing disks, progressing as needed, from medium grit to fine grit disks. The disks we use are made by Standard Abrasives and made from a tough resin reinforced nylon fiber with aluminum oxide which acts as an abrasive element. Since the nylon web is un-woven it is more flexible and so will follow the contours of the bronze.

To remove fiber particles, dust or other surface impurities we clean the piece with an air pressure hose.

Blend the liquid oxides in a non-reactive container to achieve the desired color.

Heat the pull to about 200° and apply the dye oxide blend to the areas you want to color with a very fine paint brush.

After the casting has cooled re-buff any areas that need to be re-worked or where you want to expose the golden color of the raw bronze.

Seal with a clear wax or use tinted waxes to create to add a different hue.

Sources:

www.sculptnouveau.com

www.birchwoodtechnologies.com

www.birchwoodtechnologies.com

Color in Nature and Hot Patinas for Door Handles

The green anole lizard was the inspirational basis of Martin Pierce’s lizard door lever. The lizard’s vivid pea green color is however a challenging finish to capture as a bronze patina and one that requires considerable dexterity and access to a blow torch, so hobbyists should proceed with caution.

While the lizard door knob is not of the anole family, as you can see from the photo below he is often specified by customers who want a similar finish to match his mate.

Lizard Door Lever and Lizard door knob

In an earlier post we described how to create an antique patina on bronze by using Birchwood Technologies' M20 product and how this chemical solution, through chemical conversion, creates a brown black patina that penetrates and bonds with the bronze. The cold patina process is a necessary first step that has to be taken before moving on to create a  hot green patina as without it, the green solution will tend to slough of the surface of the bronze. Once the blackened piece has dried it is then gently burnished to remove some of the cold patina from the lizard area. We mix white, pea green and yellow dye oxides, available through Sculpt Nouveau, to create the right shade of green which is applied several times to the handle to achieve the right hue. Throughout the hot patina process the handle is kept at a temperature of about 200° by using a blow torch.

The vivid greens are used by many creatures as camouflage that allow them to blend in with surrounding flora as is the case with this praying mantis that was wonderfully hidden in the variegated tones of this begonia vine.

Custom Door Handle Videos

At long last we are making videos for our custom door handles and will be sharing these with you both on our new Video Gallery and on YouTube and DailyMotion.

The first video was shot on location at a private residence and features our Lizard Entry Thumb latch set.

The big advantage to showing our custom hardware in this format is you get to see and understand what we mean by “functional art”. The lizard sculpture acts as a large bronze door pull and you grip the body of the lizard to open the door or in this case front gate. Above the lizard there is a sculpted bronze back-plate reminiscent of stone, on which a butterfly is perched. The butterfly is also a functioning thumb latch and when depressed it opens the gate by releasing the mortise lock.  On the reverse side or inside of the gate we used a smaller lizard sculpture to act as the door lever and to continue the natural theme mounted the lever on a bronze back-plate styled to resemble tree bark. Lizard food, in this case a small beetle, is used as a whimsical bronze turn piece that functions to either open or close the deadbolt.

As the lizards have been made as lefts and rights they will also will work well on door double doors or gates.

In this particular project we created custom grills at the top of the gate in the form of flax stems and appropriately added a left and right bronze frog to complete the entrance. As Martin Pierce is also a wood carver he carved a wooden raven head to house the chain for the house bell.

While I hope you find this description clear I hope you will agree that the video does a better job of capturing the three dimensional reality of this set.       

While videos are fun to watch they can be difficult to make  so our thanks go to Jeff Jenkins whose patience as  director and skill as a videographer made this project a success. Jeff’s work can be seen at;