Creating an Acrylic Spray Aquatint Test 16

December 30, 2014
Researchers: Audrey Blood / Jenny Gover
Room Temperature: 67 degrees F
Humidity: dry
Materials: Golden GAC-100, Golden GAC-200
Abstract: Comparing full-strength GAC-100 and GAC-200 painted on a bare copper plate to see how they removed in the stripper bath

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Procedure:
We painted GAC-100 and GAC-200 in full-strength and watered down consistencies on opposite sides of a degreased (but otherwise bare) 4.5″ x 6″ copper plate.

The plate was set to dry for 45 minutes and then placed in the stripper bath of 3 cups washing soda to 12 liters of warm water for approximately 1 hour, rinsed, deoxidized, and dried.

IMG_4849
GAC-100 and GAC-200 painted on a bare plate

Conclusions:

Mixture
Thin coatings of both GACs began to dry within 5 minutes. Thicker drops of GAC took less than 35 minutes to dry. Even giant globs were dry within 45 minutes.

Stripping
After 30 minutes in the stripper bath, the GAC-100 flaked off with a little rubbing. One hour total in the stripper bath was enough to dissolve most of the GAC-200, and the rest was scraped off by hand under running water. The sections of the plate under the GAC-100 were oxidized, while the sections of the plate under the GAC-200 were not oxidized. Soy sauce appeared to take off most of the oxidation caused by the GAC-100. Based on the time to strip GAC-200, we decided to proceed with GAC-100 for our stop out mixture.

IMG_4852 IMG_4853

IMG_4859
GAC-100 and GAC-200 dissolving in stripper bath over time

Creating an Acrylic Spray Aquatint Test 17 >