Has anyone as of late been experiencing the more than usual difficulties in tinting 1.67? After numerous conversations with various tint suppliers (BPI & Phantom), talks with lens manufacturers (Shamir, Augen and Younger & hard coat suppliers, I am still experiencing more problems that normal. Temps. are correct, time in the baths is fine, ph is okay, tints are not spoiling and the end result more times than we would like to see is a blotchy white affect pointing right back to the front surface hardcoat. We even just set up a new tank dedicated strictly for 1.67 with all the 1.67 preps, etc.... same issues. Any suggestions that anyone has is welcome. I would like to add that these lenses in question are supposedly tintable. We do apply UNNV to the back surface and there is never a problem with the back surface. Obviously, the majority of lenses are made in China and then sold to the major manufacturers who brand and label them. Could this be an issue from the point of origin and how can it be overcome?
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