It has been a busy week at Antique Bronze. I’ve completed an Art-Deco lamp which had been hit by a lorry and am finishing the restoration of a small bronze- plated sculpture scarred by galvanic corrosion.
Damage to an Art-Deco Lamp hit by a LorryThe Art-Deco lamp will have some follow-up posts as there were some difficulties I had when restoring it – particularly trying to find the perfect filler. I usually mix my own with bronze dust and polyester resin, but this wasn’t suitable for this particular object. Finding a good copper-alloy filler that will take a patinated finish, won’t corrode the bronze, and has some flexibility in it, will be a future mission. Watch this space!
The small statue was interesting as it had a raised corrosion layer much like a form of bronze acne. Other than these small pimples, the surface was in good condition. The cause of the corrosion originated with something acidic being sprayed across the statue’s surface, which etched the thin brass layer and caused a reaction between the two differing metal layers that made up the statue’s form: an outer layer of brass with an inner core of iron. Read more about galvanic corrosion on Antique Bronze’s blog.
The corrosion was hard and I found the best way to remove it was by breaking its structure using a very fine file, but as the corrosion broke up, it revealed a small pit. Now the struggle was how to lesson the disfiguration of the pitting. Re-surfacing the statue would be one way, but that’s highly interventive and not my approach. I tried mixing some pigment with a hard beeswax to fill the crevices, but as the surface was otherwise smooth – any slight excess of wax was detectable. Instead, I warmed the surface to drive off any moisture and applied soft clear wax into the pits using it like a filler. The soft wax was easier to wipe from the surface so didn’t result in the same build up as the hard wax had. Leaving it to harden, I later burnished and reapplied another layer. Finally, I lightly stippled with a little wax tinted with earth pigment over the pits and the results are shown below.