Question

it's perfectly round , sometimes has rainbows , it could be permanent , but can also disappear please guess what it is

Answer 1

Answer:

bubble?

Explanation:

i don't know about permanent but sure, it's all of those.

Answer 2

Answer:

I think it is bubbles.

Explanation:

Bubbles are perfectly round usually. Bubbles can sometimes have rainbows by/with reflections. Bubbles could be permanent depending on what type/size and other things but bubbles can also dissapear as they usually do. Hope this helps!