>Traditionally, dichromates were used for silkscreen work. Ferric systems
>were marketed by Autotype and others for some years but now I think they
>pretty well have switched to diazo compounds. It is just a matter of
>reading the labels.
What are diazo compounds ?
I was sure, that polymer silkscreen emulsions were developed to substitute
the dichromates-based ones. Is it right, that they still content
dichromates, as Bob Maxey insists ?
Does anyone know for sure ? Wat is the chemistry of photopolymers ?
Regards,
Galina.