The gold coating increases the actual exposure and is many times dispersed.
You might want to try AR coating beneath the SU*

Shay

-----Original Message-----
From: mems-talk-bounces+shay=mizur.com@memsnet.org
[mailto:mems-talk-bounces+shay=mizur.com@memsnet.org] On Behalf Of Gary
Hillman
Sent: Tuesday, January 10, 2012 10:35 PM
To: 'General MEMS discussion'
Subject: Re: [mems-talk] SU-8 process development

Sounds like you did not expose the material properly. Gary