Example of cyanotype on glass, not designed to be an image:
Artist who uses cyanotype, polaroid emulsion lift and film soup:
Very important artist working with cyanotype on glass:
How to print on glass:
Creating cyanotypes on glass is a little more complex than the other materials as you have to combine the usual solution with gelatine in darkroom conditions. I usually create the gelatine according to the instructions and then add 25ml of each cyanotype solution. This is for half a pint of chemicals. The gelatine needs to be carefully heated from cold with slow mixing to avoid the creation of air bubbles. Once the gelatine is nicely thickened slowly pour your cyanotype chemicals in, continuing to stir gently. Pour your mixture through a sieve into a light tight container and leave for 24 hours. Be careful not to burn your mix at any point! When you are ready to prepare your glass make sure that it is perfectly clean and free of grease. Wear gloves. Use a black light or your UV lamp to check the glass for the tin side. All flat glass is floated on molten tin, this will leave a trace under the light. Apply your mix to the tin side as the gelatine is less likely to float off. Carefully tease the emulsion across the plain of glass as thinly as possible. Any run off can be captured in a clean tray and reused. If you are reusing emulsion then sieve it each time you transfer it back to your light tight container. Expose the image in UV light. My small tests took 30 min on a UV lamp. Carefully clean the glass with very cold water. You will have to change your water several times. Leaving the emulsion to harden for around 30 min in the cold water. Dry for 48 hours. Your image may look light at first but the emulsion will darken down over time. Using this process on glass can allow you to create images with multiple layers. These examples are on small pieces of glass that are warmed by a fan heater before applying the solution. You should heat gelatine slowly in a Bain Marie. See link below for more details.
NB: The gelatine is only fluid when warm and the cold glass can shock the chemicals creating water tension marks and streaks or blobs.
Someones experiment with agar agar