Has anyone ever heard of this term. We are using it to describe a problem we are having along an exposed region of photoresist where the resist "pops" off leaving a semi-circle in the remaining pattern edge. We are using a 5 minute vapor prime but we have seen the same problem at lesser times so I dont think we are overpriming the wafers. You can immediatly tell after exposure if mousebites are there as they leave a bubbly area in some areas of the wafer which is visible to the eye before develop. This problem does not occur every time (15-20%). Any suggestions would be greatly appreciated. Please reply to phowell@i-o.com Regards, Pat Howell