Copper Sulfate – Saline Etch for Aluminum – Test 9: Citric Acid Degeneration Test (Part 2)

Name: Nick Osetek & Tessa Chambers                                                 Date: 4/24/2018

Room Temperature: 67*F                                                                    Humidity etc: Dry

Experiment Title: Citric Acid Degeneration Test

Experiment Goal: We continued using Bath 4 (12 oz spent copper sulfate saline bath, 1 tbsp citric acid) until depletion. We cut another six plates (plates 7-12) to etch.

Plate material: Aluminum (5052)

Plate Preparation: Buffed with fine grit steel wool, degreased with Bon Ami and soy sauce, backed with contact paper

Evaluation of Plate Preparation: Normal

Etching Bath Notes: We have been etching in the bath for 21 minutes so far. The bath was murky and slowly getting darker from use. Instead of a milky green from use the bath was turning gray with the new citric acid mixture.

Time in bath: 18 minutes total in 3 minute increments

After Bath Evaluation: Bath 4 was getting rapidly weaker compared to our original saline sulfate bath. The bath was an even darker gray after this test.

Removal of Grounds: N/A

Inking Methods: Bone black oil-based etching ink, 10% 00 burnt plate oil (Nick inked these plates to keep wiping methods consistent)

Paper Type: Hahnemuhle Copperplate

Soaking Time: 1 Hour

Press, blanket set up, pressure: Pragda, 2 blankets, 4/9-left 4/8-right

Conclusions: Our prints of plates 7 – 12 were lighter compared to citric acid test #1, but all 6 plates (7-12) were consistent with each other in tonal range.

3-minute plate comparisons. Plates 1-6 and 7-12. First 6 plates etched hot then leveled out with plates 7-12.

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