Wow, 3 days. Either you have a fast strain, or it very well could be contamination.
If it is mycelia, you will see little white dots evenly spread through the grain. In time each dot will grow out in a little radius of "fans" or ropes.
If using spore water, you may see tormentose before seeing rhizomorphs, or your fuzz.
If using liquid fermentation inoculate the fans are immediate.
After the spots increase in size to aprox. the diameter of a dime, or your pinky, shake the jars. When they come back, the jars should be bright white, depending on your species. Some mycelia is more linear vice rhizomorphic as well as having different shades of white.
Cobweb mold is white as well, but it is easily detected; if you get fuzz growing well above your substrate, 1/2 to 1 inch above, and it looks like cotton, and it is FAST growing, that's it. In time it will turn gray, giving it away.
If the jars come back extremely fluffy, well above the top of the substrate, and it is hard to shake apart that's it.
Beware of baccillus (sp?) it is recognized by uninoculated grain. If several grains have not been taken, this is a sign. Beware of anything that is not fully white and completely taken. Can give off an odor reminiscent of sour green apples.
If it's white,
that's outa sight!------------------
What little I know....
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Richard_D_James
gratefulredhead
anima
Room4Shroom