nontoxic, water soluble dye

[Justin Walker-3]

While this is strictly speaking not an ImageJ question, I was hoping
people on the list could be of assistance since many of us work with
optical photography.

I am looking for a water-soluble, non-toxic (IE, can pour down the drain
after use) dye that is not soluble in silicone oils and is not surface
active.  I wish to use this in conjunction with an appropriate optical
colour filter in order to make water droplets in a silicone oil phase
more visible.  I do not want it to effect the interfacial tension
between the phases, and ideally I do not want it to stain the aluminium
and glass cell, either (or at least be easily cleaned afterwards).

Does anyone have any suggestions for an appropriate dye?

Thanks;

Justin Walker,
University of Maryland

[Wolfgang Schechinger]

Hi Justin,

what about fountain pen ink, felt tip pen refill, an aqueous or alcoholic (you may even use vodka as solvent ~:)) extract of plant leaves or flowers (ground with some clean sand and solvent added).

Have fun!

Wo

-------- Original-Nachricht --------
> Datum: Fri, 18 Jul 2008 16:25:32 -0400
> Von: Justin Walker <[hidden email]>
> An: [hidden email]
> Betreff: nontoxic, water soluble dye

> While this is strictly speaking not an ImageJ question, I was hoping
> people on the list could be of assistance since many of us work with
> optical photography.
>
> I am looking for a water-soluble, non-toxic (IE, can pour down the drain
> after use) dye that is not soluble in silicone oils and is not surface
> active.  I wish to use this in conjunction with an appropriate optical
> colour filter in order to make water droplets in a silicone oil phase
> more visible.  I do not want it to effect the interfacial tension
> between the phases, and ideally I do not want it to stain the aluminium
> and glass cell, either (or at least be easily cleaned afterwards).
>
> Does anyone have any suggestions for an appropriate dye?
>
> Thanks;
>
> Justin Walker,
> University of Maryland

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[Uttaro, Bethany]

Hi Justin,

How about powdered food dyes? I've used them for a number of
applications, and although they are capable of leaving stains on hands,
they wash off by the end of the day. Clothes come clean in the wash. I
haven't had any problem with FDC Blue #1 staining glass, and have used
it regularly at 200ppm. The only time I've had problems with staining
for the longer term is when using equipment after it and the floor
around it has been cleaned with a quaternary cleaner. Bleach-based
cleaners did not cause the same problem.

The water-soluble food dyes I've used haven't mixed with oil, which was
dyed a contrasting colour, but I can't answer for the interfacial
tension.

Food dye supply companies are usually happy to send along samples of a
few hundred grams just for the asking. One of the larger ones in
Sensient.

Hope this helps.

Bethany
AAFC

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of
Justin Walker
Sent: Friday, July 18, 2008 2:26 PM
To: [hidden email]
Subject: nontoxic, water soluble dye


While this is strictly speaking not an ImageJ question, I was hoping
people on the list could be of assistance since many of us work with
optical photography.

I am looking for a water-soluble, non-toxic (IE, can pour down the drain

after use) dye that is not soluble in silicone oils and is not surface
active.  I wish to use this in conjunction with an appropriate optical
colour filter in order to make water droplets in a silicone oil phase
more visible.  I do not want it to effect the interfacial tension
between the phases, and ideally I do not want it to stain the aluminium
and glass cell, either (or at least be easily cleaned afterwards).

Does anyone have any suggestions for an appropriate dye?

Thanks;

Justin Walker,
University of Maryland