Xorkoth,while colour is indicative of degradation,it always way overstates the degree of degradation.I posted an HPLC stability study with a methanolic solution of it:
http://www.bluelight.ru/vb/showthread.php?p=2942755#post2942755
"I was curious how stable this 4-HO stuff really is.5-MeO-DIPT.HCl,DPT.HCl,DMT freebase and such stuff can be stored unchanged for years at RT when protected from light.
4-Acetoxi-indol itself,storing at 0° in a brown container for about 7 years showed still a pure product according to HPLC.I've recently checked freshly obtained 4-HO-DIPT which were grey crystals with a purity >99%.The methanolic HPLC solution (2mg/ml) was let standing at RT in the light and reassayed:after 6h,it was still unchanged and colorless.4 days later a slight discoloration towards a grey/violetbrown got apparent but HPLC looked still fine,only a very little noise in the baseline starting to stick its head out.
15 days later,the solution has turned brown and the content has fallen to about 92%.As a general rule,discoloration is a valid indicator of degradation but usually overstates the degree.
I would not store unfreezed solutions of these compounds (maybe only in degassed liquid and with VitC or BHT added at 0° with no light present) for longer periods.As pure crystals I'm confident they will hold purity rather long if kept in freezer/light protected.The hydrochlorides are probably considerably more stable.Will check the 4-HO-MIPT as well now."
The Hydrochloride is way more stable,this seems confirmed now.Quick check is if its watersoluble,then its the hcl salt.