Black coolant

Feser One Non Conductive UV Cooling Fluid for Water Cooling 1 Litre : Black - specialtech

PrimoChill ICE Non-Conductive Coolant (32 oz.) - Black / UV Blue - w.c.u.k

Mayhem Pre-Mix X1 Oil Black - 1Ltr Non Conductive Coolant - mayhems
 
I used feser one in last build and had that going for about 4 years, didn't change the liquid once and at the end of it it had stained the tubing slightly (buti reckon that was plastisiser and could be washed off anyway) and left no deposits it's in any blocks. Recommend it to be honest.
 
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