Hyposulphite of Soda 1 lb.
Alum 1/4 lb.
Water 1 gal.
When the soda and alum are dissolved let it stand until all sediment
settles to the bottom, then pour off the clear solution and use it
to fix until from much use it becomes black and turbid, then make up
and use a fresh solution. [p058]
The plate should be left in the fixing solution for fully five
minutes after it appears thoroughly cleared, then take it out and
wash until all traces of hypo are removed.
If the plate has not previously been in the alum solution it may now
be put in the