I had to store different natural compounds (Berberine, Piperine and Curcumine), dissolved in ethanol and in buffer; I kept them on the bench, in an appenderf, covered in tinfoil and put in a box. Should I put them at -20°C or throw them away in the garbage?

P.s. piperine was not in tinfoil, because the solution was almost transparent and not yellow.

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