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Magic Tricks
Posted: Thu Jul 12, 2012 9:45 pm
by dinakar
hi..
magician can turn lemon juice into blood red.
which chemical to apply on the knife or blade to cut the lemon
Re: Magic Tricks
Posted: Mon Jul 23, 2012 6:41 pm
by GrahamKemp
It sounds like a simple acid/base indicator colour change.
From household products an amature magician can prepare boiled juice of red cabbage, which contains flavin (and is a high school chemistry practical). It will turn green in basic solutions, red in acids. Simply stain the knife an let dry until the cabbage juice becomes unnoticable ... until wet by the lemon juice
A professional might resort to methyl red indicator.
Posted: Wed Jul 25, 2012 10:54 pm
by dinakar
thank you sir