This solution is used in 2 media and was first defined in medium J228.
1
Dissolve 0.2 g of Fe(NH4)2(SO4)2 x 6H2O in 5 ml of distilled water containing 2 drops of concentrated HCl. When the Fe(NH4)2(SO4)2 x 6H2O crystal have dissolved, bring volume up to 100 ml.
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