Kodak
RAPID SELENIUM TONER
Probably the most useful of all types of toner, and has a variety of effects,
depending on paper type and dilution. The image will be intensified, extending
the tonal range, while also being protected against atmospheric oxidation.
Changes in image colour depend on the type of paper being used, chloro-bromide
papers being affected the most, bromide papers the least. With chloro-bromide
papers the shift is towards a heavy purple-brown. Other papers with a
lower chloride content, such as Bromofort, will tend to give a more pure
purple colour as well as exhibiting an intensifying effect. 'Split-toning'
is possible with chloro-bromide papers - the deepest shadows alter in
colour while higher tones are unchanged. Currently Forte Museum is the
best for this technique. Resin-coated papers will show little visible
change, but the treatment is still recommended for maximum permanence.
Selenium toner is a single bath which does not use bleaching. There is
some risk of staining if prints are not thoroughly washed, Hypo-Clearing
Agent is therefore recommended. Dilution is between 1+3 and 1+20 depending
upon paper type and effect required. Selenium toner is toxic, so good
ventilation and gloves are mandatory.
Selenium toner COSHH data
If interested in using selenium toner for archive purposes, see the link to Wilhelm Research from this info section.
Check the current re-thinking regarding the permanising effects of selenium vs. polysulphide toners.
