Can I give a coloured liquid properties to turn clear when it dries or cools ?

[Jonno2018]

Hi All, 
First post on this forum, Hopefully in the right section, looking for some help please;

Not sure if this is even possible but as the title suggests,
is it possible to give a coloured liquid properties so that once it dries, cools or evaporates it turns clear ? 

I've seen a glue on the market which is purple and turn clear when it dries, but I'm wanting this to dry without residue and be like water.

Thanks In advance 

Jon

[DrP]

What is the application you are after? This might determine what can and can't be used.  

Clock reactions spring to mind. Although I am not sure what you want the liquid for.  The iodine one goes from clear to black after a predictable amount of time. I think there are other similar reactions based on the same chemistry where the balance of the reaction is kept in check by another chemical - once it gets used up it changes colour. Maybe there is a clock reaction that goes clear or something - idk - you'd have to look it up. The iodine one is the reverse of what you want - starting clear and going deep purple/black.

 

 

We make a paint that is white...  but dries clear.  This is just because the emulsion is white whilst dispersed but is clear as a dried polymer film once it has coalesced.  Sorry - I know that doesn't help - as I said - might be easier if we knew what your application/need was.

 

[Jonno2018]

Thanks for your input DRP,

That's kind of thing I'm hoping to explore.

Application wise I'm just after a solution that I can write with that dries clear and leaves no residue and is non harmful. Once dry the surface will not affect skin etc and be okay to touch.

I guess there are disappearing inks already in use but are these usable on any surface ?


Ideally a number of colours could be used.

Thanks,

[DrP]

Lemmon juice?

It is clear  -  you write it and it is clear when dry.  You can heat it and the paper discolours and the writing becomes visible again.   Won't work on your skin though I wouldn't have thought.

[dimreepr]

 Welcome to SFN Jonno  but why??? 

Edited August 14, 2018 by dimreepr

[Jonno2018]

Good thought DRP but I'm looking for something that is visible for a short while before vanishing , and on most surfaces.

Lemon juice would not be visible unless on white paper I assume.


Thanks,