> So if polyester stocks are stronger, why do Kodak and ORWO make print
> stocks with acetate base?

1. It's cheaper.

2. You can cement splice it, so it can be used to make intermediates.

3. It's not as strong.  The polyester stock is so strong that if you were
   to run it in a Mitchell and it jammed, the camera movement would fail
   before the film did.  This is a problem for optical printing.

4. The print looks different.  There is some light piping through the base
   of the polyester print which makes for a slightly different look on screen.
   If anything, the polyester looks more like a nitrate print than an acetate
   print does.  It's a very small difference, but it's something you can notice
   on a really good print on a big screen.

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