Glue a circle of "slush paper" (it's similar to slush powder, only in a paper-like form) into the bottom of a small white styrofoam cup or a "Dixie cup" , any cup with a white interior . The cup may now be fairly shown empty .
(previous to starting the effect you load a TT with a white silk and have it on your hand)
Show the cup empty. Pour milk (use evaporated milk, made with water rather than whole milk) into the cup . Take the cup into your right hand and as you grab the cup shove your thumb (with TT) into the "goo" in the cup . It will grip the TT in place . (careful with how you time it; the "slush paper" doesn't gel quite as fast as the powder, which is an advantage in this case.)
In one smooth move turn the cup upside down and simultaneously pull the white silk out of the TT .
The silk will appear and the cup will be held upside down , "obviously" demonstrating that the milk has been transformed into the silk. (be very casual in how you handle the cup to take the heat off of it.......it's just a common paper cup ,after all )
This is a surrounded version of the same effect which utilizes a m_ _ _ _ r glass .
The only source I know of for "slush paper" (rather than "slush powder") is :
You could use powder for this , but you couldn't show the cup empty . Or else secretly introduce the powder after the cup is shown empty.