Uses of diethylene glycol

PVia

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Hi all...

When diethylene glycol is added to a solution of a particular chemical and water, is the reason because the glycol will help the preservation properties of the solution?

Is there any photographic reason ( ie, a particular result that can be seen in a print) for the glycol?

Thanks!
 

CBG

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Often the non water solvents are used precisely because they are not water: not aqueous. Some developing agents dissolved in Triethanolamine (TEA) and similar non aqueous solvents seem to be very slow to degrade by oxidation. HC110 is one example of such a developer. Add water and HC110 apparently will degrade at more normal rates.
 

Alan Johnson

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Nov 16, 2004
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Geoffrey Crawley wrote (Amateur Photographer 1 Aug 2009):
"With regard to glycol,its inclusion is now standard practice in concentrated liquid developer formulae,if of a type that needs to be protected from crystallisation in low temperature storage conditions.When this protection is necessary,I use mono-ethylene glycol at around 2.5%."
 
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