Wow..I like the concept / idea. Maybe there could be a hidden compartment that keeps the other pop in it that can pour out. Sort of like the way the tea kettle trick works for holding the silks.
Maybe the can can be divided in two compartments horizontally or vertically with some type of insert and based on how you turn or hold the can to pour, you could get either pop out at the correct time.
I like the idea. Ill try to think of something. I'll post if any ideas come to mind. I actually already have somewhat of an idea, but it would be nearly impossible to do.... I like this concept and will work on it.
Heavy duty gimmick. Two cans with separate compartments and rotating mouths. It'd be a b***h to construct, but i'm sure it could be done. It'd have one side smaller than the other side, and have the smaller side filled with the original drink from the can. The opposite drink in the bigger side, so if you pour the drink out, it would look like almost like a full can, giving a better illusion than if the cans were half and half. So you'd open both cans, pour a little out, to show it's just the regular drink. Rotate the tops (secretly of course), and empty the cans into a glass.
I'm also thinking of the division in the can's contents being horizontal instead, but this is all just me typing while I think.
you could play with the idea of placing dye in the bottom of two opaque cups and clearly pouring 7 up in the one with the brown dye and vise versa with the Dr. pepper. If youd like. a lil more practical (not much, but a lil) than gimmicky cans
For the light colored soda to dark colored. You could have some sort of gimmicked bottle with a separate compartment below the label. If the seal was broken the light colored soda would mix with the dark and you wouldnt be able to tell the light was there. Cool little transformation idea.
It has already been done. this exact effect.
The product is Spirit Can by David Ethan.
its cheap, but its only a booklet.
I think its a ridiculous trick to prepare but the effects are freaking amazing.
1. You play 3 can monte. two cokes, one fanta. you cover them with shakers or whatever, and mix them. they pick the fanta can but you pour out coke, you open one of the coke and its fanta.
2. you take out a can of orange soda, you shake it up. but when you open it, only water comes out. you pour it again, orange soda powder pours out.
3. you open a can of orange juice and nothing pours out, you cut the can open and you find an orange,