1) About a mixture 2) Mixture 
• (a.) Pertaining to, or of the nature of, colloids.
of the nature of a colloid.
<chemistry> Of the nature of a colloid. ... (18 Nov 1997) ... 
pertaining to a colloid, i.e., involving particles so minute (less than 2 microns) that they are not visible through optical microscopes. Bentonite is an example of a colloidal day. 
Col·loid'al adjective Pertaining to, or of the nature of, colloids. 
Type: Term Pronunciation: ko-loyd′ăl Definitions: 1. Denoting or characteristic of a colloid.
adjective of or relating to or having the properties of a colloid
A gel-like mass which does not allow the transfer of ions
pertaining to or of the nature of a colloid: colloidal gold and silver.