Dear MEMS community,

I would like to test a microfluidic device.  For this I would
like to render the fluid very visible, to a camera, like many
famous pictures of coloured or fluorescent liquid in capillaries.

My problem is that I do not know what kind of liquid does that.
If anybody knows the answer, please help me.
I would appreciate knowing the commercial name of the agent,
and if there is any special procedures to use it (is it mixed
in water?  or alcohol?).

Thank you very much!

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