![images/Pileus_KOH_reaction_no_colour_change/Pileus_KOH_reaction_-_no_reaction.jpg](images/Pileus_KOH_reaction_no_colour_change/Pileus_KOH_reaction_-_no_reaction.jpg)
Place a few drops of a 10% KOH solution on the pileus surface of fresh material. Any colour changes occur rapidly. If there is a colour change, it is often visible also on dried material.
SAFETY NOTE: KOH is corrosive at higher concentrations.
Choose this state if: there is no colour change on application of KOH, or only a slight intensification of the original pileus colour.