Hi,
        Right now we're using chrome-gold-chrome layers, 100A-150A-100A to
protect for glass etching. I noticed that if I do a BOE etch over 35
minutes, it starts to eat through the layers some and makes the channel
edges rough. I wondered if, in addition to thicker protective layers, the
preparation of the glass surface had an effect, say a SC-1/BHF clean
instead of H202:H2SO4.

THanks,

Ziggy