Did you word this correctly. I think Shiply makes Microposit MF and Hoechst (also known as AZ) makes the AZ 351. Basically the only difference in developers is the surfact used, and concentration of TMAOH. I would use the Shiply developer on the Shiply resist. In my opinon, the best developer for Shiply 1813 is Shiply MF 319. Hi all, I would like to know what is the difference between Microposit MF 351 and Shipley AZ 351. The target photoresist is Shipley 1813. Thank you all in advance. Joolien