I have no clue about the intricacies involved, but as a crazy idea to throw 
out, could you make the source pdf transparent at put it -on top- of the one 
you generate?
.Jerry

> On Nov 2, 2019, at 2:24 PM, doc hawk via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> 
> On Nov 1, 2019, at 5:42 PM, Mark mentioned,
> 
>> 
>> Is it possible to pick up the background color from the mouseColor or the 
>> backgroundColor or something and set the background color of the field to 
>> that? (and obviously forget the bit about setting the blendlevel)
> 
> The problem there is that there may be writing underneath my field in the 
> “source” pdf that I am “filling”, and I can’t obscure that.
> 
> Pdf can handle transparencies, and placing partially transparent images over 
> others.
> 
> If I’m not missing something, it’s a bug in Livecode if it generates a pdf of 
> a field with no backgroundColor and false opaque for Sheffield, card, and 
> stack.
> 
> And as I mentioned, the “effective opaque” of the field reports as false.
> 
> 
> 
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