...do plastic bottles not have caps? I'm confused.
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their caps are fully plastic, not painted metal. The non-screwtop metal caps need to be bent to release their grip on the bottle. That scrapes the paint off the metal cap.
it's more likely that paint is scratched off by other caps, idk about metal caps but plastic ones are usually handled in bags, thrown into a cap feeder that aligns them and loads them into the capper. I expect metal caps to go through a similar process, and all that movement is bound to scratch it and send particles everywhere.
So this study only applies to glass bottles with plastic painted metal caps? Not unpainted metal caps or full plastic ones?
That is my impression. To be honest, I don't think I've ever seen a glass bottle with a plastic cap. And I can't really recall seeing what looked like unpainted metal caps except for homebrew stuff (and even then, it might be painted to what we think unpainted should look like).
Had those standing around, although I am not enirely sure the metal one isn't coated.
Ok, I seemed to have forgotten about the existence of non-beverage glass bottles when looking at this post. I was only thinking of like soda, beer, and wine glass bottles.
Those are beverages (cider snd water respectively), I am unsure how you got to non-beverages?
I don't recognize either brandings and they looked like sauce bottles (like varieties of vinegar, seed oils, marinades, etc). 🤷
Ok, great find, we can simply switch the caps & solve the problem.
(The corps will do that, right??)
But I wander with such tests ... could there be any significant detection issues?
Did they have the proper equipment and processes? A methodological limitation to particle size maybe?
Coz some researches find higher concentrations than 100.
But the plastic bottle can still create a lot more, surely.