D19 developer (Kodak, Paris, France): Dissolve 64 g D19 developer in 400 mL water.
This can be used several times on the day of preparation, but discard after use.
Stop solution: 350 mL of 1% (v/v) acetic acid/1% (v/v) glycerol.
Fixing solution: 350 mL of 30% (w/v) sodium thiosulfate.
0.25% Toluidine blue (Sigma) filtered through a Whatman general-purpose filter.
Depex mounting medium (Merck BDH).
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