[pure-silver] When is Sulphide toner not sulphide toner?

Whilst it is well understood that sulphide toners protect images from
deterioration, when it comes to the odourless sepia toners, like
thiocarbimide, I'm assuming that the end product is also silver sulphide.

If it is silver sulphide, which we all know has brown tone, why then, if I
tone a fixed and washed print in thiocarbimide, before it is bleached, does
it have a marked effect upon subsequent bleaching and yet has NO visual
effect on the image?


-- 
Regards Chris Woodhouse


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