 Further methods of identification are chemical tests.With the application of FeSO4 to the cap cuticle (pileipellis), it will turn a dark grey, almost black color and with the application of potassium hydroxide or NH4OH it has a negative coloration.The context stains a bluish grey to an olive green when FeSO4 is applied to it, a pale orange to a pale yellow with the application of KOH, and negative with the application of NH4OH.