>size, is watercolour paint in fact ground to fine what is the size of the
>particles in various paints such as acrylic, raw artists
>quality pigments,etc, these are some of the questions that spring to mind.
Thank you Bas for this very interesting reply I am sure we can all learn
from it
> Maybe one can find clue on the colour pages that are linked from CoOL,
http://palimpsest.stanford.edu.<
> Particle size can be measured by using a standardised block of
stainless steel that has a =B1 1cm wide groove cut in it, This groove is
"deep" at one end (=B11 mm) and becomes less deep to zero in about 15 cm.
Putting the choosen paint or whatever in the deepest point, by use of a
scraper it is spread along the groove. As long the pigment particles are
embedded in the paint medium no scratches are formed on the surface of the
paint. The moment the surfaces shows small parallel "scratches" the pigment
sticks through the paint medium and reveales its size. This can be read at
the side of the groove. In this way particle size from 1 mm to very small
sizes can be easily and accurate determined. Doubtless there are some
standardized tests for this, (DIN, TAPPI, ANSI and the like.)<
Would you know Bas where I could purchase such a fasinating instument ?
there is a strange new world of pigment still to be discovered.
The next question is what particle size is considered the optimum for
direct carbon printmaking
Thanks once again
pete