If a solution was added to the cooling system it was a dye to be used with a UV light to check for external leakage.
What you described sounds like a tool designed to take a sample of the gases coming from the cooling system. The fluid in the tester will react with hydrocarbons (combustion chamber gases) and change color.
If no hydrocarbons are present the test fluid will not change color and the car is ok at that point.
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bigB427
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