Hi: The problem may well start before the development step. I suggest you check your pre-cleaning steps. Anything reain on the surface? In the exposre step I would check if the artwork damaged or poorly defined. To what step are you exposing? If these steps check out ok, it might be developer strength or temperature or both. Finally it might be track damage from the conveyors. These are but some of the most common problem areas that lead to mouse bites. If you are using Dry film, how old is the resist and under what storage conditions was it kept? There might be some cold flow and thinning out of the resist that could accerbate the above problems. Good Luck L. roos ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################