"Sniff test" and chemical reagent into the radiator!?

I've been noticing some bubbles into the expansion tank. At first, I've simply supposed the little bubbles were generated by the recirculation of the coolant flow into the expansion tank. Later, I decided to do a deeper analysis about their nature making a "sniff test" (to check hydrocarbons concentration) and a cylinders compression test.

Both results seems to be quite good. The "sniff test" is negative, so no combustion gases into the coolant and the cylinders compression test returns values between 142 psi and 139 psi (9.8 - 9.6 bar). Mechanic excluded air locks, as well, so the little bubbles really seem to be generated by the recirculation of the water flow.

Mechanic also added a powder, a reagent (a chemical agent) into the expansion tank to check the presence of combustion gases. He told that this powder will have the effect to change the coolant color if any trace of combustion gases is present!!
I've never heard something about that "chemical powder". Now something ..."extraneous" is present into my coolant system and I don't know how that chemical agent can react with the OAT5 coolant at high temperatures.

I'm not a mechanic or an expert, so here I am asking for your help and learning something more!
Please, do you know and trust this kind of product? According to you, could that reagent damage the coolant system, head gasket or, worse, our "beloved" K-Engine? Do you think it'd be better to wash, drain and refill the coolant system again?
(...if so I must get ready to order 3 Xpart OAT5 bottles ).

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Last edited by dado; Today at 16:28.

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"Sniff test" and chemical reagent into the radiator!?