Looking for a dye for heat transfer fluid

[advsign]

I am looking for the name of the powder colorant that you add to heat transfer liquid. I know there is some powder that you can add to Dow Syltherm XLT to change the color from clear to blue or pink. I just do know know the name or where I can find it.

Now if we have a leak, the liquid is clear like water so we need to add a color to it so the leaking can be visible.

Thanks in advance,
Ken

 

[IPGBen]

Ask supplier (Dow?)

Ben

 

[advsign]

I asked Dow (Dow China) but they tell me that there is no such thing. I do remember in the states we used something but I was not involved in that project.
Ken