Usage examples (5)

• For use, 100 c.c. of this solution are mixed with 6 c.c. of a pyrogallic solution of 1: 10, without the addition of any bromide.
• The developing agent with the pyrogallic and formic acids will keep good
• I have found the protonitrate of iron, as also the protosulphate, and not seldom the pyrogallic, so difficult of application, that I have stained and spoiled very good...
• A great advantage of the pyrogallic developer which I recommend, is that of its being able to be diluted to almost any extent, with no other result than simply making...