Always add 1 part H2O2 to 3 parts H2SO4.

Barry Isenor
System Integration
Electrical and Computer Engineering
University of Calgary


-----Original Message-----
From: Hongjun-ECE [mailto:hzeng@ece.uic.edu]
Subject: RE: [mems-talk] About the Piranha cleaning

Belford,

Please confirm that it is H2So4 added to H2O2, instead of H2O2 added to
H2So4, which might be dangerous.