Date: March 6, 2014
Room Temperature: 68 degrees Fahrenheit, dry
Researcher’s Name: Cathe Janke
Objective: Can every image be treated with the same Levels in Curves in Photoshop or does each image require individualized adjustments?
Image was prepared in Photoshop:
Opened and changed to TIFF file
Image>new adjustment layer> Invert
Img>new adj layer>Channel Mixer. Selected “monochrome” option
Img>new adj layer> Curves. 3 points on the curve:
Input 20/Output 0
Input 129/Output 127
Input 219/ Output 171
Input 253/Output 200
Gray Gamma 2.2
Print option–shape: round
Lpi = 80
Plate A, dpi 544
Plate B, dpi 300
Plate Material: .032 Copper
Plate Size: 4″ x 6.5”
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.
Etching Notes : The plate was etched in a 42 degrees Baume Ferric Chloride bath in a vertical tank.
Time in Bath: 20 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: looks good.
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, warm white
Paper Soaking Time: 20 minutes
Press Blanket Setup: Takach pressure at 5.5, 2 blankets, sheet of newsprint
The settings in Curves or Levels should be tested for each image, a set number does not seem to work for every image. The dpi might need to be 72.