Uses of diethylene glycol

[PVia]

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]

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]

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%."

 

[PVia]

Thanks all!