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Just try experimenting in tiny quantities.
To inspire, some ideas could be strontium nitrate / copper benzoate / chlorine donor for purple or barium nitrate for aqua or turquoise.
Even potassium nitrate can make a good blue base with copper compounds if there is enough of a chlorine donor! (to cool the flame as well).
Potassium perchlorate and chlorate should both burn very well with copper benzoate.
-MDH
You know of any blue comps using only pot. nitrate as the oxidiser
