How does Princess Peach mix the potion to become invisible ?

Okay, what's wrong with you people is that you don't read the notes on the walls. The notes tell you exactly where to put all of the potions if you just read them. Then start the machine, and when the beaker goes to a potion window, press the button on the window. Then uses your best judgement to time the heating for 30 seconds. the resulting beverage should be green, and not make Peach huge.

The pattern is red blue orange green.

Ok, !!!

Oh yeah, sometimes the potion is wrong because of timing.

It is not like other games, it has to be exactly 30 seconds not higher or lower so look at the clock or a watch.

Also when it is done heating, the potion should be green then you know it is correct.

The order you put the potions in the machine is: red,blue,orange,green. Then do as TEC tells you but when he asks you to count to 30 then do it in Mississippi's it worked for me.

Red blue orange green and count to 30 miniutes worked for me

This is very simple. Its not hard at all. As long as you follow directions nothing will go wrong. If you choose to follow you're own instincts then you will fail. In order from left to right four colors in a beacon should be set. Red,blue,orange,and green. Turn on the matching and press the bottom only to dispense in front of beacon. Heat for 30 seconds, not more or less. Potion should appear green.