What type of fluid does NHRA use

[hemidup]

to check combustion chamber cc's? I have a set of questionable heads and have cc'd them with isopropol alcohol and food color, Everclear and food color, a mixture of RV antifreeze and distilled water, just enough antifreeze for color and parts washer solvent. I know they won't use the Everclear, but I want to use what NHRA uses.