press n peel test 27
Date: November 15, 2013
Room Temperature: 70 degrees Farenheit, dry
Researcher’s Name: Cathe Janke
The purpose of this test was to return to the original directions given in test #17. Upon reading more of their suggestions on the next things to try, the tester decided to only change the dpi of the printer and see how this would effect the image. Since blacks are coming out fine, the tester decided to stay with 20 minutes for the etch time.
1. Kept image as a jpeg. (original file form, imported from camera)
2. Image > size> 5.667, 4.25, 300 dpi
3. Layer> New Adjust Layer> Invert
4. Layer> New Adjust Layer> Color Balance Highlights- Cyan= -31 Magenta= 0 Yellow= -26
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, 720 dpi
8. Print, same as original directions, except, dpi on printer at 600 dpi.
Print Parameters Used Let Photoshop determine colors. Gray Gamma 2.2. Rendering intent=Perceptual. Presets= Plain Paper, Resolution HQ 600
Plate Material: .032 Copper Plate Size: 4.5″ x 6”
Plate Preparation : Small scratches from the iron are visible on copper, but do not show up after etched. 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
: 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 SoySolvII cleaner and left to soak for 5 minutes. Ground was then wiped off easily with a rag.
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, then hand-wiped.
Paper Type: Hahnemuhle, white Paper Soaking Time: 1 ½ hour
Press Blanket Setup: Takach pressure at 5.5, 2 blankets, sheet of newsprint
Comparing this test to previous ones, more gray tones were visible in this test. Resolution on printer at 600 dpi seems helpful to achieve a more even gray tone.