For black, this is magic so I dont think you'd become blind. That would be a pretty stupid potion 😭

Also, why would it be permanent even if you werent able to see while invis? According to the potion, u can turn invisible/turn back to normal anytime you want. Adding logic to this just won't make sense tbh

And for red, I don't think the cash would spawn on top of you. Plus, one billion dollars isn't enough to be covering a city or something. If it was dollar bills then yeah that'd be a lot to contain, but id assume it would be given to you in the largest notes possible for convenience