Avi Laker If the resist is still present without an image - my guess would be that 120C for 10 minutes is to long, exposure is to short or developer may be bad.... A L Message: 4 Date: Mon, 12 Mar 2007 21:12:21 -0700 From: yitianp@email.arizona.edu Subject: [mems-talk] hi for help about the develop To: mems-talk@memsnet.org Message-ID: <20070312211221.xnhcts04c0s4gcc4@www.email.arizona.edu> Content-Type: text/plain; charset=3D"ISO-8859-1" I spin S1813 at 4000rpm 45s. Then hot bake 120Degree 10min Exposure 10s, then develop 30s.After 30s, I can't see anything. Why??? All paper recommend the develop time 30s.