Definition of «yellow stains»

The phrase "yellow stains" refers to marks that are left behind on something, usually clothes or objects, which appear yellow in color.

The only downside to this concealer is that it leaves an orange / yellow stain on my eyes after a few hours. (maybelline.com)
If there is any bit of yellow stain I just put the diaper in the sun for a hour or so and it gone! (thirstiesbaby.com)
Even though I picked the lightest shade possible for my pale skin, it STILL left yellow stain. (maybelline.com)
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