Digital BW, The Print

>Looks like tiny fragments of glass sparkling in the light.

Would that be 

"ImageLife's proprietary coating is a non toxic silica binder" ?

(ref Permajet pdf catalogue p5)

 - I'd thought (not very seriously though) that they meant silicate
binder (as silicates seem more likely to bind ...) but perhaps they
really do mean silica in which case they are little bits of glass. 

I imagine they are not meant to be visible, but I can see them in a
sheet of "Omega" from a recent batch. The ink does not seem to adhere
to/cover perhaps a few dozen tiny spots per square cm, but only one or
two of them per square cm are what I'd call objectionable - to be
honest I had not noticed them until trying somewhat brighter light
than my normal display - at which point the eboni was also starting to
look a bit light too.  The bigger ones are definitely seen to glint.

ps. my vision is not perfect, and this inspection was aided only by my
glasses, but in bright light (not calibrated).

I'm not sure, but delta looks better on a small sample of sheets.

Ken