Larry Blanchard wrote:

Hmmmm. AFAIK, stain is pigment particles (solids) in suspension. That's why
they settle to the bottom of the can. Dyes are dissolved pigments (liquids).
Stain particles lodge in the pores of the wood. The denser the pores, the
denser the paticles. Dyes soak into the wood, with or without pores,
although they will penetrate deeper in softer sections.

Note the interchange of the terms "dye" and "stain" used by Behlen:

http://www.woodfinishsupply.com/SolarLux.html