Using methylene blue to disinfect used N95s

2,646 Views | 22 Replies | Last: 3 yr ago by Jabin
cone
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AG
saw this article online and thought i might share in case you have N95s for home or office use and wanted to regenerate them without having to bake them (which is tricky, trust me)

https://newsroom.uw.edu/news/researchers-find-cheap-easy-way-disinfect-n95-masks

i bought a MB 1% solution dropper bottle for like ten bucks off the internet and i think the mix is 8 drops in one liter of distilled water (which is sprayed on the mask inside and out). then you let the masks dry in the sunlight.
Tx-Ag2010
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Seems like a lot of work considering the virus doesn't live that long on porous surfaces. Why not just rotate masks every few days?
cone
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ymmv regarding the amount of work. i took an extra class and got that minor in chemistry.

you could just call it cheap insurance
The Fall Guy
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Wear a bandana. Wash often.
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normaleagle05
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What do you suppose they're infected with?

And if wearing a mask can't hurt then why do they need to be disinfected?
cone
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In the article it said 6-8 drops of MB 1% per liter of distilled

I think it's 10 micromolar
bigtruckguy3500
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normaleagle05 said:

What do you suppose they're infected with?

And if wearing a mask can't hurt then why do they need to be disinfected?
I think you're generalizing and confusing regular masks with N95s.

You're right, a common saying is that people should wear masks because it can't hurt anything, but it could help. The idea behind that is that regular surgical masks and cloth masks help protect other from you, incase you're infected, by preventing droplets from spewing all over the place. It may also protect the wearer by decreasing viral load if they are exposed, leading to a less symptomatic infection.

However, N95s are typically worn by individuals that are going to be exposed to sick patients - such as doctors and nurses. The purpose of those masks is to protect the wearer. So the N95 is more likely to have the external surface covered in infectious virus. If you have to reuse the mask, and you were exposed to a high level of virus, there's a chance that the external surface of the mask could be covered in virus that you'll be touching when putting it on and taking it off. Donning and doffing PPE correctly actually takes training. But disinfecting masks can help reduce spread if we believe that the viral particles on the mask are infectious.

Most people I know just rotate the mask. Back during the summer and fall you could leave it on your dash board in Texas and it'd more than be sterilized.
500,000ags
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Is there a distributor or website selling N95s to the general public yet?
coolerguy12
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OP specifically said "home or office use". Using them in the Covid ward is a totally different story.

99% of the people wearing masks have no idea what they are doing and I think it's a valid question to ask if they are doing more harm than good with them.
cone
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so you're saying I shouldn't be wearing a N95 in enclosed public places?
coolerguy12
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cone said:

so you're saying I shouldn't be wearing a N95 in enclosed public places?


I don't think you should be wearing a mask at all unless you consider yourself high risk.
cone
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well then
lazuras_dc
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I've been using a UV light box you can find on Amazon. Seems simpler.
GAC06
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I keep my mask in my pocket until absolutely necessary, then I put it on much like a ribbon or an arm band to show compliance. I assume my pocket disinfects it.
bigtruckguy3500
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coolerguy12 said:

cone said:

so you're saying I shouldn't be wearing a N95 in enclosed public places?


I don't think you should be wearing a mask at all unless you consider yourself high risk.
Would also recommend it if you're going to be around people you'd like to protect in case you are sick.
cone
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if PPE works in HC settings to protect the wearer, why wouldn't it similarly work in the civilian world?
GAC06
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I don't know what kind of settings you are talking about but doesn't the CDC consider close contact 15 minutes inside six feet? Masks in healthcare settings make sense. Masks in 95% of normal indoor settings are pointless.
coolerguy12
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So people are just going to wear masks the rest of their lives "in case they are sick?" Or is it just for 2 more weeks?

I'm going to choose to not live my life pretending to be sick and being afraid of everyone I'm around. That's not a life worth living.
bigtruckguy3500
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I know you have an opinion that won't change no matter what I say, but we will get through this pandemic and we'll get to a point when the likelihood of catching and transmitting this virus will be about as likely as maybe the measles (that is, very unlikely, except for occasional community outbreaks). In which case, local communities should start wearing masks till the outbreak comes under control, but in general most people won't need to.

So no, I don't anticipate people being told to wear masks for the rest of their lives.

Maybe if another virus emerges that is able to rapidly spread and overwhelm hospital systems then yes, we should do what we can to keep that from happening. Mitigating spread also helps mitigate the need for shutting down businesses. Masks help reduce viral loads if you do get exposed and help build herd immunity through asymptomatic infections (hypothetically, there's some evidence, but it's not proven yet).

But hopefully if we're in this situation again, we'll have the knowledge and experience to prevent things from getting as bad as they are. And hopefully we'll all understand that everyone can do their part to prevent the overload we're seeing on hospital systems.

Maybe it's because I'm quite used to wearing masks for long periods of time, and being around immunocompromised people that could die if I'm not careful, but I don't understand how wearing a mask and taking precautions to protect others makes life not worth living.
CowtownEng
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bigtruckguy3500 said:

normaleagle05 said:

What do you suppose they're infected with?

And if wearing a mask can't hurt then why do they need to be disinfected?
I think you're generalizing and confusing regular masks with N95s.




No, just a poorly executed troll.
coolerguy12
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You're right that you won't change my mind and I appreciate the civilized discussion even though we disagree.

I'm not a Covid denier, but I am a Covid response critic. The messaging was horrible and too many people in charge across the country made emotional decisions instead of science based decisions which pretty much caused people like me to write off all the half measures and virtue signaling going on.
GAC06
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I object to people talking about the "need" to shut down businesses even though there's basically no evidence the shutdowns have done anything but add to the destruction
Jabin
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Just saw this article and it reminded me of this old thread:

Addressing personal protective equipment (PPE) decontamination: Methylene blue and light inactivates severe acute respiratory coronavirus virus 2 (SARS-CoV-2) on N95 respirators and medical masks with maintenance of integrity and fit | Infection Control & Hospital Epidemiology | Cambridge Core

Pretty impressive results. I wonder if spraying your mask with the methylene blue would make it more effective while wearing it?
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