Japanese Base Card Staining?

I see alot of old Japanese Pokémon cards with this sort of stained botchy background (see image). Is this normal?

In some cards I see it and some in the same set/Pokémon card I do not.

Would this be something that happens over time specifically in the Japanese sets or is this the original design?

Thanks!

This looks like holo bleed. Fairly common.

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The top layer wasn’t as thick so what you’re seeing is the holo pattern underneath. It’s rarer to find cards without this. I think all but two of my base set japanese cards have it.

Thanks I remember having a few cd promos like this, now I know why. I guess this doesn’t really influence value at this time.