Robert,
I'm sure everyone on the list will agree that you have become a
valuable resource!
This knowledge is a terrific find, and will help to expose the
charlatans that pop up to take advantage.
Chuck
On Fri, 21 May 1999 19:37:59 -0500, [email protected]
wrote:
>Hi Ya'all,
>
>One list member has sent me a sample of what they are buying as 500 ppm
>CS. So I ran a study of the material and this is what I found.
>
>The CS was as dark yellow with a strong Tyndall. When I diluted the
>sample 50/1 in preparation of doing the spectrophotometer analysis, I
>observed a strange phenomena.
>
>Normally the yellow CS when dilute water it is clear. This material
>remained quite yellow.
>Being suspicious I placed drop on a piece of white paper along side a
>drop of very
>yellow CS of my manufacture. The drop of my CS dried with no color. The
>other
>sample had a bright yellow stain.
>
>The ppm reading was 35 not 500!!!!! The yellow stain appears to be from
>yellow food color.
>
>Just another rip-off.
>
>Someone is sending me a sample 100 ppm wateroz, and I will find out what
>is in it.
>
>Just to refresh the memory of many of the listers, the yellow color of a
>true CS is due
>to the colloid' s adsorbing the blue light out of the light spectrum so
>we see yellow. One cannot duplicate that with a food dye.
>
>Robert
Gravity isn't MY fault--I voted for velcro!
--
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