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#1
April 20th 06, 04:05 AM
posted to rec.photo.darkroom
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Keeping qualities of low-sulfite, metol-based film developers
Is a certain concentration of sodium sulfite critical to the keeping
qualities of developers that use metol as the only reducing agent? To put the question in context, consider a hydroquinone-free variation on DK-50: metol 6g sodium sulfite 30g sodium metaborate 10g postassium bromide 0.5g water to make 1 liter With the relatively low sulfite level of 3%, would such a developer be less stable in storage (in full glass or nalgene bottles) than D76H or D23, which call for 10% sodium sulfite? If so, what is the minimum level of sulfite required for good keeping qualities? 
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