Solution A

Ascorbic acid 10.0g
Phenidone 1.0g
Water to 1 litre

Use deionised water, not tap water, since impurites can reduce the life of the solution. Dissolve the ascorbic acid, the add the Phenidone; warm slightly and stir patiently until the Phenidone has dissolved. Filter and bottle. Shelf life approx. 3 months.


Solution B

Sodium metaborate 87.5g
Water to 1 litre

Tap water may be used for B, which will keep indefinitely.

Note: you may find it easier to start with 750ml of water, mix in the chemicals, then make up to 1 litre - Barry.

Just before use, mix 8 parts water with 1 part A and 1 part B, in that order.

Suggested exposure; +1 to +11/2 manufacturers indicated film speed (Test!)

Suggested developing times @ 20ºC (Test!)

		Ilford Delta Pro 100		10-11 mins
		Ilford Delta Pro 400		14-15 mins
		Ilford Pan F Plus		7 mins
		Ilford FP4 Plus		9-10 mins
		Kodak T-Max 100		11-12 mins

Note: the above formulation is the copyright of Dr Blood. He has released it for trial by private individuals and other small users only. Larger users, or those wishing to take the concept further into larger scale use or production, should contact the author via the BJP.