A new method for producing cyanotypes on glass based on the formation of a PVOH/PVP copolymer.
The polymer is safe and easy to prepare. Coating process is much more easy than with gelatin, making the process much simpler to master.

Use typically 1 part of citric acid for 10 parts of colloid.

Research references about PVOH crosslinked polymers :
- Sapalidis, Andreas. (2020). Porous Polyvinyl Alcohol Membranes: Preparation Methods and Applications. Symmetry. 12. 960. 10.3390/sym12060960.
- Huang, S.-M.; Liu, S.-M.; Tseng, H.-Y.; Chen, W.-C. Effect of Citric Acid on Swelling Resistance and Physicochemical Properties of Post-Crosslinked Electrospun Polyvinyl Alcohol Fibrous Membrane. Polymers 2023, 15, 1738.