On 06/19/2016 01:37 PM, `Richard Knoppow wrote:
I think the older ones are the two can variety. The reason many
developers come in two parts is that Metol, which is the main developing
agent in them, does not dissolve in a solution of sodium sulfite so it must
be dissolved before the sulfite is added. Kodak came up with a method of
encapsulating the sulfite (I don't remember the details) which allows all the
ingredients to be mixed as a single powder. You will find the same thing with
Dektol, where early packages separated the poweders into two parts, later,
when supplied in bags, it came as a single poweder.
When mixing the formula from scratch its probably a good idea to boil the
water first to drive off dissolved air to reduce the amount of oxidation of
the metol.
On 6/19/2016 11:25 AM, Tim Daneliuk wrote:
On 06/13/2016 09:54 PM, `Richard Knoppow wrote:
FWIW:I see some formulations of NOS DK-50 around that are a single can and some
Kodak Developer DK-50
that are in two part A and B packets.
Questions:
1) What's the difference?
2) Is the stuff likely to still be OK to use if in a sealed can or packet,
even if it is quite old?
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Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
