For this test I have borrowed a textile screen which is a coarser 43T. I’m don’t know what the thread count is per inch but I will only pull the powder through 4 times.
The Optul colours that I am using are:
Chrome Green (FF 0076/0) Red (FF-BF 1015/0)
Orange (FF-BF 1025/0) Light Green (FF 0072/0)
I have decided to use the same firing schedule, 825ºC for 15 minutes. I have also ensured that I am printing on the non-tinned side.
Again the result are a bit underwhelming. The light green is almost invisible and the red is more of an orange but it is a nice deep orange. The chrome green and the orange fired okay. The high temperature has caused devitrification. The previous firing was cloudy but i presumed it was picking up the bat wash from the kiln shelf.
To conclude, the Optul colours seem too muted for my liking. I was hoping for more vibrant colours. Also I was expecting a greater range of coloured powders as transparent enamels are only available in blues, greens, yellows and pinky violets.
I am considering laminating strips of fusing glass onto the back of the windows, or creating each symbol with fusing glass and laminating each symbol to the windows. This would mean that the edges of these constructed symbols would be visible through the sandblasted window.
However I was happy with the results of the enamels test, but I wanted more variety of colours. Alternatively I could just use a nice bright yellow as this could contrast with the cool sandblasted background.
I covered the back of a sandblasted version with resist, then removed the resist from behind non-sandblasted area with a scalpel. Then I applied mixed enamel into the cut out areas.
I received an email answering my query regarding the silkscreens and the screens used in the printmaking workshop use imperial threads per inch. So the 120 screen is within the accepted threshold.