this post was submitted on 23 Jun 2025
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The researchers found an average of around 100 microplastic particles per liter in glass bottles of soft drinks, lemonade, iced tea and beer. That was five to 50 times higher than the rate detected in plastic bottles or metal cans.

"We expected the opposite result," Ph.D. student Iseline Chaib, who conducted the research, told AFP.

"We then noticed that in the glass, the particles emerging from the samples were the same shape, color and polymer composition—so therefore the same plastic—as the paint on the outside of the caps that seal the glass bottles," she said.

The paint on the caps also had "tiny scratches, invisible to the naked eye, probably due to friction between the caps when there were stored," the agency said in a statement.

This could then "release particles onto the surface of the caps," it added.

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[–] maki@lemm.ee 3 points 18 hours ago* (last edited 18 hours ago) (1 children)

I find this article confusing. Can someone explain it in a simple language as if I am stupid or sth

[–] NoSpotOfGround@lemmy.world 5 points 16 hours ago

Bottle caps are stored in big bags of some sort before being placed on bottles.

They have sharp edges and they scratch each other's paint as they shift around in the bags.

The scratching produces a fine dust of plastic/paint particles. The dust covers all sides of the bottle caps in the bags.

The caps are placed on the bottles. The dust goes into the liquid inside the bottle. People drink it.

[–] BigBenis@lemmy.world 22 points 1 day ago

For the people in the comments who either won't or seemingly can't read the article: The paint on the top of the caps is plastic-based and before they're put on the bottle they're stored in a big jumbled up pile where the paint chips off and coats the caps in tiny flakes. When the cap gets put on the bottle, the flakes on the bottom of the cap get washed off into your drink. Studies show that washing the caps first dramatically reduces the micro-plastic contamination.

[–] LovableSidekick@lemmy.world 115 points 2 days ago (2 children)

In a bizarre twist, plastic bottles have been found to contain alarming levels of microglass.

[–] creisel@lemmy.zip 21 points 2 days ago (1 children)
[–] Hupf@feddit.org 18 points 2 days ago (1 children)
[–] creisel@lemmy.zip 12 points 2 days ago* (last edited 2 days ago)

Yea it's coarse and everywhere

https://youtu.be/2tLf1JO5bvE

[–] copdeb@crazypeople.online 8 points 1 day ago

jajaajajajajajajajjjaaj

[–] be_gt@lemmy.world 171 points 2 days ago (3 children)

So nothing coupled to the glass but rather the cap having a extra plastic layer on the wet side.

[–] MrQuallzin@lemmy.world 125 points 2 days ago (4 children)

Sounds like we found the issue, now it's just a matter of producers improving the caps

[–] fluxion@lemmy.world 43 points 2 days ago (1 children)

Nah ill just spend $50 to have a Congress member introduce a bill to make regulating microplastics illegal

[–] Swedneck@discuss.tchncs.de 4 points 1 day ago (1 children)

meanwhile in the EU we'll move back to cork

[–] vorpuni@jlai.lu 1 points 19 hours ago

Don't worry the cork will still be filled with microplastics from the soil used to grow it to the adhesive used to bind it.

[–] ieatpwns@lemmy.world 67 points 2 days ago (1 children)

Only if it doesn’t cut it to record profits

[–] lemerchand@sh.itjust.works 6 points 1 day ago

Only if it somehow increases profit. FTFY

[–] Signtist@lemmynsfw.com 20 points 2 days ago

Ha! Good one.

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[–] Infinite@lemmy.zip 56 points 2 days ago (1 children)

No, the paint on the outside.

[–] NoSpotOfGround@lemmy.world 28 points 2 days ago* (last edited 2 days ago)

Yes. So many people are misunderstanding this article... The microplastics are on the inside, in the drink, and they are bits of the paint from the exterior of bottle caps that stuck to the inside of other caps when the caps were all jumbled together in big bags before they were placed on the bottles.

[–] forrgott@lemmy.sdf.org 26 points 2 days ago

That would be far more intuitive, but it's not that - it's the painted logo on the outside.

[–] UltraMagnus0001@lemmy.world 7 points 1 day ago

WTF. Guess I'm an android now, because I'm half plastics on the inside.

[–] Karyoplasma@discuss.tchncs.de 69 points 2 days ago (1 children)

Step 1: Invent plastic bottles

Step 2: Pocket the cash

Step 3: Things got bad? Outsource the clean-up to the end user in the form of recycling

Step 4: Increase prices to account for recycling

Step 5: Laugh as the idiots actually recycle your shit

Step 6: Throw the whole shebang in the ocean or in landfills

Step 7: Pocket some more cash

Step 8: Pat yourself on your shoulder. You've done some capitalism.

[–] bollybing@lemmynsfw.com 39 points 2 days ago

You forgot the step where they invent a logo that looks almost the same as the recyclable logo and stick it on all plastics but it doesnt mean its recyclable but instead just says what kind of plastic it is.

[–] MTK@lemmy.world 47 points 2 days ago (12 children)
[–] 6nk06@sh.itjust.works 10 points 2 days ago

Corka Cola.

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[–] Agent641@lemmy.world 21 points 2 days ago

Just pour it from the glass bottle to the plastic bottle. Problem solved

[–] daniskarma@lemmy.dbzer0.com 15 points 2 days ago* (last edited 2 days ago) (4 children)

Title seems misleading.

As the micro plastics were found on the paint outside the bottle cap. It seems complicate that that ended on the drink itself. Unless you are licking the bottle cap it doesn't seem that relevant.

[–] iglou@programming.dev 32 points 2 days ago

No, the microplastics were found in the content of the bottles. The cap thing is where they come from. As a reply to you explained, the microplastic from the top of a cap is scratched by another cap and ends up on the bottom of yet another cap.

[–] Gobbel2000@programming.dev 23 points 2 days ago* (last edited 2 days ago) (2 children)

The paint on the caps also had "tiny scratches, invisible to the naked eye, probably due to friction between the caps when there were stored," the agency said in a statement.

This could then "release particles onto the surface of the caps," it added.

Paint scratches off the outside, then sticks to the inside and makes it into the drink.

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[–] Smoogs@lemmy.world 7 points 1 day ago* (last edited 1 day ago)

I think because there is a helix twist that glass would grind away the plastic every time it’s recapped. Hence why at the end of the article it is urging manufacturers to use air and alcohol to clean the cap before fitting it to the bottle. Additionally using something other than a plastic cap to reseal the bottle when being used. And especially not one with a helix requiring a twist. You can use a wine reseal which requires no twisting

[–] creisel@lemmy.zip 14 points 2 days ago

Wait...we not licking bottle caps anymore?!

[–] Numenor@lemmy.world 13 points 2 days ago (5 children)

We just need glass caps then

[–] zaphod@sopuli.xyz 32 points 2 days ago (2 children)

Or just unpainted aluminium caps.

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[–] Shapillon@lemmy.world 9 points 2 days ago

In a bizarre twist, glass caps have been found to contain alarming levels of microdrink.

[–] creisel@lemmy.zip 12 points 2 days ago (1 children)

When I was a kid they were made from metal

[–] SoleInvictus@lemmy.blahaj.zone 11 points 2 days ago (5 children)

When I was a kid they were made from cork.

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[–] Korhaka@sopuli.xyz 6 points 2 days ago* (last edited 2 days ago)

I quite like the swing tops with a small rubber ring that makes the seal. Easily reused too. Which is better than recycling.

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[–] Bosht@lemmy.world 26 points 2 days ago (3 children)

Man on the surface this reeks of inside payoffs. I guess the technicality is plastic caps on glass bottles?? Which seems weird and nothing I've ever seen. Unless they're referencing the seal on the inside of some metal caps on glass bottles? Either way, seems suspect. I'd assume that overall drinking from glass is safer, as with plastic on any timeline you're dealing with the plastic breaking down and leaching chemicals and micro plastics into the liquid, which wouldn't be an issue with glass.

[–] Infinite@lemmy.zip 50 points 2 days ago (11 children)

Not plastic caps, plastic paint. The printing on bottlecaps is a polymer and it gets scuffed.

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