How do I fix the rainbow machine?

Hint 1 of 5:

Look at what's hanging from the machine.

Hint 2 of 5:

There are seven flasks.

Hint 3 of 5:

Just like the seven colors of the rainbow.

Hint 4 of 5:

You need to pour something in those flasks to make a rainbow.

Hint 5 of 5:

Find red, orange, yellow, green, blue, indigo, and violet potions, and put
them in that order (left to right) in the flasks.