One year ago I made a micronutrient stock solution for MS medium and the solution appeared colorless. Yesterday I made the solution with the same composition but the solution turned yellowish. What caused it ?

 

Composition:

CuSo4.5H2O

Na2MoO4.2H2O

H3BO3

MnSO4.4H2O

KI

ZnSO4.7H2O

CoCl2.6H20

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