To give you an idea of how BAD this stuff is, I once saw a demonstration
consisting of droping  a lead pencil into piranha, it disappeared in puff
of black sooty smoke.  This stuff is not called piranha for nothing. SC1
and SC may take longer but it is far far safer. Gary

-----Original Message-----
From:   Barry Isenor [SMTP:bisenor@ucalgary.ca]
Sent:   Friday, July 15, 2005 12:07 PM
To:     'General MEMS discussion'
Subject:        RE: [mems-talk] About the Piranha cleaning

Always add 1 part H2O2 to 3 parts H2SO4.