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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[–] BigBenis@lemmy.world 14 points 15 hours 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.

[–] UltraMagnus0001@lemmy.world 6 points 17 hours ago

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

[–] LovableSidekick@lemmy.world 97 points 1 day ago (2 children)

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

[–] copdeb@crazypeople.online 8 points 22 hours ago

jajaajajajajajajajjjaaj

[–] creisel@lemmy.zip 18 points 1 day ago (1 children)
[–] Hupf@feddit.org 13 points 23 hours ago (1 children)
[–] creisel@lemmy.zip 10 points 23 hours ago* (last edited 23 hours ago)

Yea it's coarse and everywhere

https://youtu.be/2tLf1JO5bvE

[–] be_gt@lemmy.world 164 points 1 day 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 117 points 1 day ago (3 children)

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

[–] fluxion@lemmy.world 40 points 1 day 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 2 points 16 hours ago

meanwhile in the EU we'll move back to cork

[–] ieatpwns@lemmy.world 61 points 1 day ago (1 children)

Only if it doesn’t cut it to record profits

[–] lemerchand@sh.itjust.works 4 points 22 hours ago

Only if it somehow increases profit. FTFY

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[–] Infinite@lemmy.zip 54 points 1 day ago (1 children)

No, the paint on the outside.

[–] NoSpotOfGround@lemmy.world 21 points 1 day ago* (last edited 1 day 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.

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[–] daniskarma@lemmy.dbzer0.com 15 points 1 day ago* (last edited 1 day 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 29 points 23 hours 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.

[–] Smoogs@lemmy.world 6 points 20 hours ago* (last edited 20 hours 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

[–] Gobbel2000@programming.dev 21 points 1 day ago* (last edited 1 day 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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[–] creisel@lemmy.zip 13 points 1 day ago

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

[–] Numenor@lemmy.world 12 points 1 day ago (5 children)

We just need glass caps then

[–] zaphod@sopuli.xyz 31 points 23 hours ago (1 children)

Or just unpainted aluminium caps.

[–] Teanut@lemmy.world 3 points 21 hours ago (1 children)

I thought bottle caps were steel.

[–] tgxn@lemmy.tgxn.net 4 points 19 hours ago* (last edited 19 hours ago)

they usually have a plastic lining inside them, or are painted.

[–] Shapillon@lemmy.world 8 points 1 day ago

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

[–] creisel@lemmy.zip 10 points 1 day ago (1 children)

When I was a kid they were made from metal

[–] SoleInvictus@lemmy.blahaj.zone 9 points 1 day ago (5 children)

When I was a kid they were made from cork.

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[–] Korhaka@sopuli.xyz 4 points 1 day ago* (last edited 1 day 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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[–] Agent641@lemmy.world 21 points 1 day ago

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

[–] Karyoplasma@discuss.tchncs.de 65 points 1 day ago

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.

[–] MTK@lemmy.world 47 points 1 day ago (12 children)
[–] 6nk06@sh.itjust.works 10 points 1 day ago

Corka Cola.

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