Baader Solar Film Quality - check for quality

Hi all,

I expect like me, many of you have bought Baader Solar Film recently
intending to make filters for the Venus Transit. If you have not done so
already it could be worth your while inspecting it carefully. I found a
recently purchased A4 sheet had several 1cm bands of light scratching across
one face. Although as far as I can see it does not affect the safety of the
film, it definitely affected the image, producing a band of scattered light
which rotated with the filter . Although the supplier replaced it of course,
it took two goes to find one free of these scratches so my suspicion is
there may be more examples out there.

Robin