Henley's Twentieth Century Formulas, Recipes and Processes

by Unknown

I.—	Pure water	30 ounces
	Sulphite soda, crystals	5 ounces
	Carbonate soda, crystals	2 1/2 ounces
II.—	Pure water	24 ounces
	Oxalic acid	15 grains
	Pyrogallic acid	1 ounce
To develop, take of
	Solution No. I.	1 ounce
	Solution No. II.	1/2 ounce
	Pure water	3 ounces

More water may be used in warm weather and less in cool weather.

• If solution No. I is made by hydrometer test, use equal parts of the following:
  • Sulphite soda testing, 80°.
  • Carbonate soda testing, 40°.

One ounce of this mixture will be equivalent to 1 ounce of solution No. I.

Pyro And Potassium Developer.—

I.—	Pure water	32 ounces
	Sulphite soda, crystals	8 ounces
	Carbonate potassium, dry	1 ounce
II.—	Pure water	24 ounces
	Oxalic acid	15 ounces
	Pyrogallic acid	1 ounce
To develop, take of
	Solution No. I.	1 ounce
	Solution No. II.	1/2 ounce
	Pure water	3 ounces

When the plate is fully developed, if the lights are too thin, use less water in the developer; if too dense, use more water.

Pyro And Metol Developer.

I.—	Pure water	57 ounces
	Sulphite soda, crystals	2 1/2 ounces
	Metol	1 ounce
II.—	Pure water	57 ounces
	Sulphite soda, crystals	2 1/2 ounces
	Pyrogallic acid	1/4 ounce
III.—	Pure water	57 ounces
	Carbonate potassium	2 1/2 ounces
To develop, take of
	Pure water	3 ounces
	Solution No. I.	1 ounce
	Solution No. II.	1 ounce
	Solution No. III.	1 ounce

This developer may be used repeatedly by adding a little fresh developer as required.