One solution.

Water............. 10 ounces

Sulphide of sodium, crystals.......... 4 ounces

Carbonate of potassium ............ 3 ounces

Adurol............ 0.5 ounce

For studio work and snap shots take 1 part with 3 parts water.

For time exposures out-door take 1 part with 5 parts water.

Glycin Developer

I

Hot water......... 10 ounces

Sulphite of sodium, crystals.......... 1.25 ounces

Carbonate of sodium 0.25 ounce Glycin............ 0.5 ounce

Add to water in order given.

II

Water............. 10 ounces

Carbonate of potash 1.25 ounces For normal exposure take I, 1 ounce; II, 2 ounces; water, 1 ounce.

Imogen Developer

I

Hot water........ 9 ounces

Sulphite of sodium, crystals......... 385 grains

Imogen.......... 123 grains

II

Hot water......... 4.5 ounces

Carbonate of sodium 2 ounces For use take 2 ounces of I and 1 ounce of II.

Diogen Developer

Water............. 9 ounces

Sulphite of sodium.. 3.5 ounces

Diogen............ 7 drachms

Carbonate of potassium............ 4.5 ounces

For normal exposure take 4 drachms of this solution; dilute with 2 ounces, 1 drachm of water, and add 2 drops bromide of potassium, 10 per cent solution.

Ortol Developer

Formula by Pent-large.

I

Water............. 1 ounce

Metabisulphite of

potassium....... 4 grains

Ortol............. 8 grains

II

Water............. 1 ounce

Sulphite of sodium.. 48 grains Carbonate of potassium............ 16 grains

Carbonate of sodium 32 grains For use take equal parts I and II, and an equal bulk of water.

Metacarbol Developer

Metacarbol....... 25 grains

Sulphite of soda,

crystals......... 100 grains

Caustic soda...... 50 grains

Water............ 10 ounces

Dissolve the metacarbol in water, then add the sulphite, and when dissolved add the caustic soda and filter.