Hi Bernd, That's a good point. I will try to find a proper exsiccator for them. Also, do you have any idea about re-bake the AZ before using them, if the sample has been left for weeks? Regards, Yingtao -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] On Behalf Of Krueger, Bernd Sent: 13 July 2009 17:07 To: General MEMS discussion Subject: [mems-talk] Storage of developed AZ photoresist Hi Yingtao, good idea to keep it dry. Have you thought about store it in an exsiccator? Regards, Bernd