The Ultimate Toner?

Peter Marshall (petermarshall@cix.compulink.co.uk)
Thu, 2 Nov 95 22:14 GMT

A UK company named Speedibrews market what sounds like an interesting
toner, which relies for its effect on the redevelopment of a bleached
silver image to give different particle sizes, resulting in a
range of different colours, from (to quote an article by it's seller)
"an incredibly black black, through a gutsy sepia to an evocative orange
hue."

After treatment in any normal bleach the toning solution contains
formamidine sulphinic acid. This is mixed with alkali and left for a
while before use, its activity increasing rapidly over an hour or so.

At the moment a kit usiong this for sepia toning is available. The
exact formula is not published. It is claimed to be a better and safger
alternative to traditional sulphide or thiourea (thiocarbamide) toners.

In the UK this toner is available from Silverprint.

Peter
petermarshall@cix.compulink.co.uk