Sulaiman
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A non-staining dye or pigment for cooling water
For absolutely no practical reason I would like to colour the cooling water that I recirculate through my condensers,
I want a dye that results in a clear transparent solution that will not clog up or corrode or stain my kit,
which consists of glass, aluminium, iron and plastics, (I'm mainly concerned about the glass)
but it must look 'cool' 
I have negligible experience with dyes, colorants or pigments so ... ANY SUGGESTIONS ?
(my backup plan is to use methylene blue)
P.S. A thermochromic pigment would be double cool
P.P.S. One of the many things that makes me shout at the television is when a chemistry laboratory is shown,
- with all kinds of vividly coloured solutions in flasks, some bubbling away.
[Edited on 8-5-2018 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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DavidJR
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What colour do you want?
Fluorescein could be cool.
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Sulaiman
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I do not really care what colour provided that it looks cool !
Fluorescein looks like a good possibility - but the colour is a bit 'common'
The more that I think about it, the more I want a thermochromic pigment,
that would be both useful and cool
P.S. I just found a blue thermochromic pigment that changes at 31 oC https://www.sfxc.co.uk/collections/thermochromatic-thermochr...
It changes from blue to clear over the range 28-31 oC.
so I'm off to look around for other thermochroics... but please add any ideas here ... thanks
P.P.S. ... WOW !
368 items on eBay UK for "thermochromic pigment"
[Edited on 8-5-2018 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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greenlight
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What about potassium permanganate.
You only need a very, very small amount to get a pink/purple colour and it all dissolves.
I once coloured an entire household swimming pool purple with about two or three teaspoons
Be good, otherwise be good at it 
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Sulaiman
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No, I thought of that but it almost always produces brown stains due to MnO2 being formed when the permanganate oxidises anything.
CAUTION : Hobby Chemist, not Professional or even Amateur
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DavidJR
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Bright pink from phenolphthalein if you don't mind your cooling water being alkaline.
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