Growth medium coloring
brambl at graz.cbs.umn.edu
Thu Jun 29 15:07:36 EST 1995
Chuck Staben's good suggestion probably stems from another useful
application of water-based culinary food colorings: to stain growth
media-agar plates and tubes in a genetics laboratory where it is essential
to keep separated media of various compositions. These coloring agents are
apparently harmless to fungi, or at least to Neurospora.
One can also get a really intense and deep color effect for photography by
combining several of these colorings.
Alternatively, for a really dark effect, use India ink in agar; but use
the real stuff, and not New Age substitutes that contain detergents and
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