Date: December 20, 2012
Researcher’s Name: Sally Mackenzie
Plate Material: .032 Copper
Plate Size: 5.5″ x 6″
Room Temperature: 68 Degrees Fahrenheit, sunny and dry
I degreased the plate using soy sauce. I printed the Pronto plate, and cured it on the hot plate for 25 minutes. Next I warmed the BIG on the hot plate for 7 minutes until runny. Then I wiped the Pronto plate with the wiping mixture (2 cups of water and 1 Tablespoon of Gum Arabic) and rolled on a thin layer of the warmed BIG. I dabbed the Pronto plate with the wiping solution, and alternately rolled the BIG onto newsprint to remove the moisture. The plate took a total of 3 rolls. The plate looked relatively even, and pink in color. This indicated a good application of BIG and Gum Arabic. Finally I transferred the Image onto the prepared plate using the Charles Brand press with 2 sizing catchers, 2 sheets of newsprint and 0.19 pressure.
The plate was etched 25 minutes in 41 Deg. Baume Ferric Chloride.
Timed Application of Mordant
Removal of Grounds
I removed the ground easily with Soy Solv and a toothbrush.
After Bath Evaluation
The plate has etched as expected. The ground remained intact in the bath.
I inked the plate with Graphic Chemical oil-based etching ink in stiff black. I applied the ink with a mat board chip and wiped with a tarlatan. I did not hand wipe.
Paper Type: Hahnemuhle Copperplate
Paper Soaking Time: Roughly 30 minutes
Press Blanket Setup: Charles Brand Press with 2 sizing catchers, at 0.19 pressure
Dabbing the wiping mixture rather than wiping the Pronto plate with it appears to be the most effective way not to disturb the BIG in toner areas. My general thoughts are that if, or when, excessive scumming occurs, the best bet seems to be to start with a fresh Pronto plate, as BIG has cooled and seized by this point and is prone to dragging around the plate with too much sponging. The final proof is mottled, suggesting either a printing issue or recurrence of whatever caused the similar effect with our paper tests. Best results in gradation appear in the standard half-tone dot pattern areas.