RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Unidentified powder

Unidentified powder is looted from the chest in Digsite tent with a chest key.It can be used on Archaeological expert who will say: "Really you do find the most unusual items. I know what this is... It's called ammonium nitrate - A strong chemical. Why you want this i'll never know...".

After that the item is changed to Ammonium Nitrate.