Carol, I don't think resist will work in KOH. I tried using photo resist in KOH it just dissolves. I use Nitride as a mask for KOH. -----Original Message----- From: Lu CarolSubject: [mems-talk] photoresist mask for KOH etching Hi, does anyone know whether photoresist can be used as mask for KOH etching? If it does, what is it? Does SU-8 work? Thanks.