This test involved several changes, based on our successes in previous trials and also upon advice from outside parties. Given this, the plate and the subsequent test has been dubbed “The Renegade Plate.” Most changes regard only the values of adjustments already existing in our research.
Date: June 18, 2013
Researcher’s Name: Liz Bannish and Stephanie Gaumond
Plate Material: Copper 0.32″
Plate Size: 4 x 5.25″
Room Temperature: 70° F and very humid
The plate was beveled, polished with 00 grade steel wool, and degreased with 1:1 soy sauce: water ratio.
The image size was changed from 72 ppi to 300 ppi.
The image was inverted.
Color Balance: Highlights- Cyan= -31 Magenta= 0 Yellow= +19. Shadows- Cyan=0 Magenta=0 Yellow= 0. The highlights value for yellow has changed.
Channel Mixer: Monochrome box checked. Values of red: 55%, green 45%. This regards a classical black and white conversion, and the values must equal 100% when added.
Levels: Black= 25, White= 225.
Curves: Black=45 White=225. Two middle points: Output 24/Input 19 (the gray-black) and Output 228/Input 235 (the gray-white). This new curve is very slight when graphed.
Aquatint screen filter= 50%, Relief 24%
Print Parameters Used: Let Photoshop determine the colors. Gray Gamma 2.2. Rendering intent=Perceptual. Presets= Our earlier Press-n-Peel with Plain Paper Resolution HQ 1200
Ferric Chloride 41 degrees Baume
Timed Application of Mordant
Removal of Grounds
Ground removed with Soy Solv Industrial Cleaner and rag and a toothbrush.
After Bath Evaluation
Plate appears to have etched well; only a very small amount of hatch marks are seen.
Plate inked with Graphic Chemical Etching Ink in Bone Black
Paper Type: Hahnemuhle Copperplate
Paper Soaking Time: 10 Minutes
Press Blanket Setup: Charles Brand Press with 2 blankets, at 0.6 pressure
Once more, the blacks are dark and whites are placed in areas of the most highlight, however the transition from one to the other is still ragged and not smooth. Graininess has reappeared in the backround. Opportunities for future testing are coming to an end, however, future tests will involve a consistency test where our process mimics exactly our most successful trial to see if we can achieve the same result. Another test, to see if a shorter etching time positively effects the image–30 minutes in quite a long time–will also be conducted.