Copper Sulfate – Saline Etch for Aluminum – Test 3: Aquatint Step-Test

Name: Tessa Chambers & Nick Osetek                                  Date: 3/15/2018

Room Temperature: 70*F                      Humidity, etc: Dry

Experiment Goal: To become familiar with etch times in the copper sulphate saline bath to create aquatint shades. (1-6 minutes increments.)

Plate Material: Aluminum (5052)

Plate Preparation (surface prep, ground application, image making process, etc): The plate was beveled, degreased with Bon Ami, then the plate was then backed. Small 1-6 minute sections were drawn in on the plate to monitor etch times for each section.

Evaluation of Plate Preparation: Aluminum plate took much more time to degrease compared to copper.

Etching Bath notes: 140g copper sulphate, 140g salt, 2 liters of warm water. This was the third use of the bath.

Time in Bath: 1 minute intervals until 6 minutes.

After Bath Evaluation: Plate was etched as planned. The bath seemed greener after this plate was etched, compared to the first test.

Removal of Grounds (chemicals used and evaluation of effectiveness): No grounds used.

Inking Methods: Hanco Bone Black oil based etching Ink, 10% Burnt Plate Oil 00, wipe plate normally.

Paper Type: Hahnemuhle Copperplate

Soaking Time: 15-20 minutes

Press, blanket set up and pressure: Pragda press, 2 blankets, Right setting: 4/9  Left setting:5/9

Conclusion: Our plate printed fairly dark without much of a noticeable difference between 3 and 6 minutes. The shade jumped quickly from 1 to 2 minutes. Making the tones much less fluid between times than we would’ve liked.

Step test 1-6 minutes

After 1 minute etch

After 2 minute etch & wiping off copper in washout bath

After 5 minute etch – stop-out fell off of plate

2nd print of 1-6 minute (right) and 0-50 sec (left) plates

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