[alt-photo] Re: grainy VDB and cyano

francis schanberger frangst at gmail.com
Sun Oct 2 22:18:17 GMT 2011

Could be the water supply. Maybe your city or county is adding something to
the water or maybe there has been heavy run off in recent weeks. Try a
gallon of distilled water with the cyanotype processing to see if it makes a
difference. You may have to filter your water.

The VDB chemistry will eventually plate out too much silver in the bottle to
give good DMAX. It does have a shelf life (maybe 3-6 months). I usually go
through a 300 cc of VDB emulsion in six weeks.

VDB, like argyrotype, is highly sensitive to changes in humidity. Sixty to
seventy percent is usually ideal.


francis schanberger


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