From: Judy Seigel (jseigel@panix.com)
Date: 06/27/00-07:51:48 AM Z
On Mon, 26 Jun 2000, Sarah Van Keuren wrote:
> >
> > Perhaps Sil or one of the other chemist gurus on the list could comment or
> > send a pointer to more information on the final Prussian Blue image.
> >
> > Thanks in advance for any info.
> >
> > Joe (smieglitz@aol.com)
> >
>
> I'm not the chemist you wanted to hear from but I can tell you that the
> cyanotyped T-shirts should not be washed in a strong detergent (I used Arm &
> Hammer) because the blue image will turn yellow. Woolite preserved the
> blue.
Sarah that was probably the washing soda in the detergent (arm & hammer
specializes in washing soda which is sodium carbonate) -- it's possible
they might even come back with tannic acid (to brown), but as far as I
know the color is a form of prussian blue and shouldn't be more harmful
than other paint or dye in clothing.
Judy
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