Chase and patina

When the cast piece is complete, and the sprues are cut-off, there remain scars where the grinder or saw was used. These areas need to be finished to match the look of the rest of the surface. To chase, is a metalworking term, to ornament metal by engraving or embossing. From this:

To this:

b_chase

Just mess it up with chisels, punches, files, hammers, stones, whatever, it don’t try too hard to make a match of the texture. It’ll look fine when you heat the spot with a propane torch, which darkens the metal by oxidation I guess.

I leave it all outside for several weeks, and I spray it down regularly with a teaspoon of cupric nitrate mixed with 12 oz water.

..and it slowly turns this nice color. This is patina.

e_chase

When I’m ready to commit to the patina, I give it a light wax to stabilize and protect it. This darkens and warms up the colors, and brings out the shiny highlights both at once. Real nice.

g_chase

h_chase

i_chase

A and Q supply a nice rock for a base, and Eureka! It is finished & ready to show.

 

Less is More 6x9 75

October 4 – November 1, 2013

Main Gallery: Joyce Brienza & Matt De Genaro
Opening Reception: Friday, October 4 – 7pm – 9pm

Paint Creek Center for the Arts
407 Pine Street
Rochester, MI 48307

Gallery Hours: Monday – Thursday 9am – 9pm, Friday 9am – 5pm, Saturday 10am – 4pm

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