Bleach.
potassium bromide 50 g
potassium ferricyanide 50 g
water to 1 liter.
Toner.
Sodium Sulphide 50g
water to 1 liter.
With Multi grade FB, use the solutions full strength, and re-use them until
they are exhausted.
With chloro-bromide papers such as
Sterling, dilute the bleach 1to9 with water, or even more, and stop bleaching
before all the density has gone from the shadows. Otherwise, the shadows don't
go dark enough when put in the sulphide bath.
Using a two-bath method gives more control over the finished result. Hypo-alum
one-bath toner, which needs to be used at around 50 deg C, has identical tones
to the sulphide toner.
Other Improvisations can be found on the following pages: