Re: [Phys-l] stock up on dyes

[Bernard Cleyet <bernardcleyet@redshift.com>]

When I was a kid back in the forties, the dyes my mother and I used 
were:  the yellow die used to color margarine (in a capsule kneaded into 
the margarine in a plastic bag.) gentian's violet for my impetigo, 
tincture of iodine, and others I can't remember. 

bc, nostalgiac.

John Denker wrote:

> Hi --
>
> Regardless of your religious affiliation, this is a good time of year
> to stock up on food-grade dyes.  The dyes in the Easter-egg kits:
>   a) are reasonably intense;
>   b) don't pose the classroom safety and/or disposal problems of
>    typical "industrial" dyes;
>   c) come in a wider range of colors than you usually see in food
>    coloring at other times of the year; and
>   d) are cheap and readily available.
>
> It's nice to have dyes on hand.  Applications include:
>   -- Color mixing.  This is a subject where many incoming students
>    are plagued by misconceptions.
>   -- Diffusion demonstrations.
>   -- et cetera.
>
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