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You get some food coloring (I liked the gel better) rub it all over your finger, and then insert your finger into the vent. Smear it all around in there. The poops might be colored a bit, lol. Don't freak out when you see a blue poop in the yard. 🤣 I like to do it in the evening. The next day...

It would be difficult to tell. All eggs vary greatly. I've done where you put food coloring inside the vents of birds who's eggs you want to mark. It works very well, there will just be faint streaking on the eggs in whichever color you choose.