In this test I used the Edinburgh mixture of 3 teaspoons Windsor Newton Watercolor Masking Fluid, half teaspoon water, and 5 eraser tips of black gouache. I am going to use a hot water bath to remove the Edinburgh lift before aquatinting and I will wear gloves during the whole process.
Date: September 9, 2009
Researcher’s Name: Elena Betke Brunswick
Plate Material: .032 Copper
Plate Size: 6 in x 9 in
Room Temperature: 73° Overcast, Partly Sunny
The plate was degreased with soy sauce that was rubbed onto the copper plate using a piece of rolled felt, rinsed and then dried with a clean rag and blow dryer. The degreasing was done two times and then I allowed the plate to sit overnight. The next day the plate had some heavy oxidation I placed the plate in a brightener bath of vinegar and water but 3 strips of heavy oxidation are still visible. I used a mixture of 3 teaspoons of masking fluid, 5 eraser tips of gouache, and half a teaspoon of warm water. I painted the lift ground unto the copper plate using a variety of different brushes for 30 minutes and placed it on a hot-plate set at 150° for 10 minutes. The Z-Acryl hard-ground emulsion was poured across the copper plate and caught in a water tray. I stood the plate up vertically and allowed it to dry in the open air for 5 minutes. The copper plate was placed in the hotbox for 30 minutes to harden the Z-Acryl. After the hardening the copper plate was placed in a bath of hot water and soaked for 5 minutes before we attempted to remove the lift. I rubbed the lift ground for 4 minutes with gloved hands and 2 people helping. After the ground was removed in water the plate was blotted dry. Aquatint was applied in five passes to the plate with a Paashce airbrush set at it’s finest setting. The aquatint was air dried for 5 minutes and placed in the hotbox for 20 minutes.
The plate was etched in a vertical etching tank of Ferric Chloride at 38° Baume.
Timed Application of Mordant
Removal of Grounds
The grounds were removed using a stripper bath of Arm & Hammer Washing Soda and water (100 grams/1 liter).
After Bath Evaluation
One area shows foul biting. This could have been a result of oxidation underneath the Z-Acryl compromising the ground.
The plates were inked with unmodified Graphic Chemical & Ink Co. Bone Black Etching Ink #514. The ink was carded onto the copper plate with mat board scraps and wiped with used tarlatan.
Paper Type: Magnani Pescia
Paper Soaking Time: 25 Minutes
Press Blanket Setup: Large Takach, 2 Blankets, .75 Pressure
Besides the area of open biting located below the leaning flower in the image the lift worked successfully. There are several possibilities that could have caused this unwanted etch. It could have been a result of too much rubbing, water was too hot in the bath, or oxidation on the plate.