[alt-photo] Re: Hydroquinone, more than 45grs/L 72 hours

[Earl Johnson]

The solubility of hydroquinone in water is only 5.9 g/100 ml at 15 
degrees C. It will not stay in solution at room temperature at 60 or 80 
g/liter.

Earl Johnson


On 7/16/2012 2:23 PM, alejandro wrote:
> Hello!
> My name is Alejandro Martell from spain,
> i usually mix "lith" developers, changing one component, or another etc... i
> have
> a problem, my favourite lith developer  that use Hydroquinone with 40
> grs./L works ok, but if i preffer 80grs./L or 60 grs./L (works better), but
> always
> precipitate 72 hours later more or less "forming crystals", i don´t understand
> it, i have
> asked to chemical engineer included one especialized forum, but nobody
> konws...
> I think the answer could be dietilenglicol....  What do you think about? thanks
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