Several things can cause the film on finished parts. One of them is the parts drying before they get rinsed when they come out of a hot dye or seal tank. Some use a small dip rinse tank for each hot tank. I rinse my parts over the tank they come out of so they don't have time to dry and then dip in a rinse tank. Another cause is dissolution from anodizing too long or at too high a current density which causes anodizing time to be too long or some thing as simple as not enough aeration or agitation. Without any details on the process, such as part size, CD, time anodized it's hard to help with specifics. Do you have a even film over the parts or streaks and spots.
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