> Is it possible for a transparent substance to be non-reflective? Or
are all
> transparent substances inherantly reflective to a certain degree?

I doubt such a substance exists.  If something was truly non-reflective,
it would be perfectly invisible, unless it was absorbing light against a
background or was emitting light itself.  I can't think of anything that
is perfectly invisible like that, though I should think that some gases
come close, but perhaps only on account of their low density under
Earthly conditions.

And there would also be the problem of total internal reflection.

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