A little bit of magic

So some things chemistry has taught me is that any magic has its base in chemistry, math and physics. Par excelance how can anyone make disapearing inc?
The answere is purely simple
You make a basic solution with thymolphthalein or phenolopthalein indicators for blue and red.
When the solution comes to the acidic enviromental air the indicator goes fromn color to colorless due to the exposure to the air.
Its just so simple