press n peel test 26

press n peel test 26

Date: October 15, 2013

Room Temperature: 66 degrees Farenheit, dry

Researcher’s Name: Kristin Fitzpatrick

Test Summary
In this test we experimented with a different sequence of adjustments in Photoshop to see if we could create a film negative that would hold blacks and give us a large tonal range within the greys.

We adjusted the image in Photoshop as follows:
1. Kept image as a jpeg. (original file form, imported from camera)
2. Image > size> 5.667, 4.25 * resolution 762.353 (changed when image size changed)
3. Layer> New Adjust Layer> Invert
4. Layer> New Adjust Layer> Color Balance Highlights- Cyan= -31 Magenta= 0 Yellow= -26 Shadows: C= 0 M= 0  Y= +45
5. Layer> New Adjust Layer> Channel Mixer > monochrome
6. Layer> New Adjust Layer> Curves, 4 points (see graph)
A: O: 45 I: 0  B: 0:62 I: 64      C: 0:171 I: 175     D: 0: 225  I:255
7. Filter> Filter gallery > preset aquatint screen*note: lines appeared on image after aquatint screen was applied
8. Filter> pixelate> color halftone> max. radius: 8
chanel 1: 108    2: 162    3: 90    4:45
9. Layer> Flatten Image

Print Parameters Used Let Photoshop determine colors. Gray Gamma 2.2. Rendering intent=Perceptual. Presets= Plain Paper, Resolution HQ 1200


Plate Material: .032 Copper 
Plate Size: 4.5″ x 6” 
Room Temperature: 66 degrees Farenheit, dry
Plate Preparation
: The plates were beveled, polished with 00 grade steel wool, and degreased with soy sauce and bon ami.
The image was printed on the PCB film with a Brother HL2280DW laser printer. The copper plate was placed on a phone book and the film was placed on its surface print-side-down. The film was carefully heated to the plate with a tacking iron for 8 minutes at 300 degrees F.

Testers found that backing the plate with contact paper was most pragmatic AFTER the plate had been ironed and cooled and with the film still adhered to the plate

Etching Notes: 
The plate was etched in a 39 degrees Baume Ferric Chloride bath in a vertical tank.

Time in Bath:15 minutes

Removal of Grounds
: Plates were saturated with Soy Solv cleaner and left to soak for 5 minutes. Ground was then wiped off easily with a rag.

After Bath Evaluation: seemed like it a good transfer.

Inking Methods
: Plate was inked with Graphic Chemical Etching Ink in Bone Black, applied with a piece of mat board. It was gently wiped in an outwards motion with a piece of tarlatan. Then paper wiped.

Paper Type: Hahnemuhle, white
Paper Soaking Time: 30 Minutes

Press Blanket Setup: Takach pressure at 5.5,  2 blankets, sheet of newsprint


Test Conclusion:
Image still too high contrast and no middle values are being achieved.

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