From: Judy Seigel (jseigel@panix.com)
Date: 10/01/01-01:08:27 PM Z
On Mon, 1 Oct 2001, Richard Sullivan FRPS wrote:
>
> The issue of the pigment grind comes up. The fineness of grind in general
> determines the color. As the grind goes finer the pigment grows paler. Case
> in point: grind some cherry Life Savers in a mortar. The finer you grind it
> the paler it gets. As stated before ball milling only makes the pigment
> disperse into solution better.
>
I doubt this analogy holds... put the "fine grind cherry life saver" in a
few drops of water or gum arabic either & I assume the color would return.
Have you tested change in color with grind in pigment? Are you sure it
was difference in size of the pigment and not simply in its dispersion?
How do you figure "fine grind" anyway? Are there absolute measures for
pigment particle size?
Judy
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