This Autopro UV coolant dye says not to use with Dexcool 

Autozone:
Certified A/C Pro Engine Cooling Systems UV Dye is an engine coolant UV dye for leak detection. Includes one application of radiator/engine cooling system UV leak detection dye. Safe for use in all vehicle makes and models (except 1996 and newer GM models that use DEX-COOL coolant). Compatible with all types of anti-freeze except GM DEX-COOL coolant.
-Contains one application of radiator/engine cooling system UV leak detection dye
-Safe for use in all vehicle makes and models except 1996 and newer GM models that use DEX-COOL coolant
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