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Old December 16th, 2015 -   #3 (permalink)
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Default Re: Is this an emulsion problem?

Sounds like under exposure. With those little 500 watt lights you need a lot of time. Try doubling you exposure time. Use an exposure calculator or step wedge test to get your times right

To test if the emulsion is good or bad. Coat one, then after its dry tape a piece of cardboard to the center of the screen on the front and back in the same spot. So no light can get to the spot on the front and back. Then set it outside in the sun for like 5 min. If the spot under the cardboard washes out but the rest of the emulsion is fine, then your emulsion is good and your not exposing long enough.