Because those are the real colors?

No, the guitar to amp “instrument line” has even lower current than the line in.

The only hazard with music instruments is if someone turns on phantom power 48V to a microphone that doesn’t use it. Then the grill can give a nasty shock and typically right on the lips.

It appears to be a line signal, so it should be fine. But then again, we can’t see what’s on the other end. Could be a nuclear power plant for all we know.

Video for anyone who hasn’t seen it

https://lemmy.world/post/43115897