When you blow into a tube of BTB, it changes from blue to yellow. When you put a piece of dry ice inthe tube it also changes from blue to yellow because of the CO2. Heat and moisture have no effect on the color change. How do we know that cooling doesn't cause a color change because the dry ice is cold?BTB and dry ice experiment?
Because your breath isn't cold and it still changed color when you blew into the tube.
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