Photo Emulsion test no. 8

May 7, 2015

Researchers: Kevin Pomerleau/ Daniel Chiaccio
Room Temperature: 65 degrees F
Humidity: Dry

Materials: Macdermid Plus 8,000 Universal Resistant Emulsion, 17x 15″ screen, Speedball Screen printing ink with extender, Exposure unit, Opaque Black Trash Bag, 2.5 lb paper weights

Abstract: to see how the Macdermid emulsion would print on super fine 250 yellow mesh screen

Procedure: Using a 14″ scoop coater, We coated a 17 x 15″ yellow 230 mesh count screen. After letting the emulsion dry for 45 minutes under ventilation, we exposed a pre made transparency using both halftone and text (a new transparency with a higher pixel count/refer to “How to halftone an image in photoshop”) by placing the transparency, emulsion side up, onto the exposure unit with the emulsion filled screen faced down over it (emulsion to emulsion). We then covered the entire unit with the opaque black trash bag and the 2 paper weights and set the exposure time for 7 1/2 minutes. Once the exposure was finished, we removed the weights and trash bag, and walked the screen to the washout booth (in a non light safe room) and washed the screen out.

Conclusion: With a mesh count of 230 the emulsion was able to properly seep in the mesh and produced a high detail image for our final prints. We had a variation of midtones and solid black lines, and the image showed about the same amount of detail as a lower mesh count screen. We also tried this emulsion on a 350 mesh count screen and were not able to pull an image at all, the emulsion itself was to thick to be absorbed by the mesh, so we recommend, when using this emulsion, to not use a screen with a greater mesh count then 230.