Verton Confused

I’ve been through Verton’s Apothocary (have Fools Gold). Supposed to “tap a crack”? I think I’m out of cracks to tap.
Any more hints?
Any more hints?
The forum for all Redshift games.
http://www.linux.redshift.hu/forums/
http://www.linux.redshift.hu/forums/viewtopic.php?f=37&t=5964