Name: Nick Osetek & Tessa Chambers Date: 4/26/2018
Room Temperature: 68*F Humidity etc: Dry
Experiment Title: Citric Acid Degeneration Test #4
Experiment Goal: We continued using Bath 4 (12 oz spent copper sulfate saline bath, 1 tbsp citric acid) to find a point of etched black for our plates. We were also still trying to deplete our bath. We etched a 6, 9, and 12 minute plate to test their darkness.
Plate material: Aluminum (5052)
Plate Preparation: We etched previously etched plates. So we cleaned the ink from the plates with soy solv II and then degreased with Seventh Generation All Purpose Spray, and backed with contact paper.
Evaluation of Plate Preparation: Normal
Etching Bath Notes: We have been etching in the bath for 57 minutes so far. The bath was getting darker due to the mixing with copper residue.
Time in bath: 3, 6, 9 minutes (all pates previously etched for 3 minutes)
After Bath Evaluation: There was little going on in the bath. It was much much weaker compared to weeks before. The was little activity visible when etching.
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: Praga, 2 blankets, 1/9-left 1/9-right
Conclusions: We did not etch to complete black. Our 6-minute print looked very similar to our 3-minute prints. And our 12-minute plate was definitely darker, but still gray not black. Our 9-minute plate made a nice mid tone between our 6 and 12-minute prints. Bath 4 is much weaker than it was two weeks ago when we started etching in it.