How to restore plastic that is yellowing/browning (using hair bleach/ Hydrogen Peroxide)

By Grover Koelpin 10 comments


Hi, and welcome to this video, on how to restore
plastic, that is browning. There is lots of guides on the internet about
how to supposedly restore the colour of plastics, so this video aims to document effectively
the use of a hydrogen peroxide based hair bleach on plastics. So this is the product I’m choose to use.
It’s got a 12% peroxide solution, but it effectively is just a cheap hair bleach. So this is me at the start of the exercise,
holding up that piece of paper, doing my comparison, and just trying to imagine what it will look
like to be a slightly more crisp white colour. It’s important to remember that this exercise
is removing some of the browning that has happened to the plastic, so it is going to
return to a colour similar, but probably not not exactly, what it was when you originally
purchased it. OK, for this demonstration, I’m just going
to take the fan cover off and utilise that. After I’ve done this, I did decide the remove
the whole fan, and do the rest of the casing, but just for the purposes of demonstration,
I’m going to take the fan cover off, and use that. Given this is peroxide solution, I chose to
just put some rubber gloves on while handling it. As you can see, it’s definitely got a bit
of a yellow tint to the plastic which originally came out something like a cream colour. As the product needs to be in conduct with
the fan cover in order to cause the lightening, I’ve very carefully gone over every area I
can, just to brush it into all the plastic that needs to be lightened. Now the next thing all the guides are very
clear about, is making sure that the product doesn’t dry out, while it’s being sunned effectively
in the sunshine. So some cling film is always recommended,
so I put a thin piece of cling film over, being careful to keep the folds out the way
of the sides where I feel the light needs to take most effect. Hopefully that will allow the light to get
in, but the moisture will hopefully will remain as much as possible within the package itself. As ultraviolet light is meant to be the catalyst
effectively for this bleaching effect, I’ve put it in the window, to catch the sunshine. I’m not going to bother showing you the wash-up,
effectively cleaning the product afterwards, but I just washed it up with standard dishwashing
soap. I popped it back on the fan once it had dried. As you can see, it definitely looks a lighter
shade. Particularly when you compare it to the rest
of the casing of the fan. Which still has a yellowy tinge. So this is a before and after photo. They’re
not perfect images, but I did hold the same piece of paper underneath both to give a comparison
of white, so at least the difference in colours in the photos wouldn’t effect the analysis. To my eye, at least, it’s pretty clear that
it has improved the shade of the plastic, returning it to more original colour in terms
of light cream, and that’s particularly evident when you look at the comparison with the case
itself, where in the “before” shot the case and the cover are very similar shades. In
the “after” shot, they are distinctly separate. So that in effect is my demonstration. It
does appear to work as a technique, so I will use it going forward, and hopefully that’s
helped someone else do the same. Thanks for watching!

10 Comments

MiriamTV2

Oct 10, 2014, 7:37 pm Reply

Would this work with yellowed resin as well?

Gabrielle

Aug 8, 2015, 3:57 am Reply

will it work in colored plastics?

Kat Lee

Oct 10, 2015, 7:07 pm Reply

thank you

David Norwood

Nov 11, 2015, 8:10 pm Reply

Is there any reason not use a 3% HYDROGEN PEROXIDE that can be bought at a drug store?

Robert B.

Jun 6, 2016, 7:07 pm Reply

Has anyone ever tried this without exposing the plastic to sunlight (or artificial UV light)?
What if the only thing the Hydrogen peroxide does is to bleach the plastic?
You wouldn't need sunlight or a uv lamp.

asma yahya

Jan 1, 2017, 7:19 pm Reply

Robotic voice

skzion2

Jul 7, 2017, 11:21 pm Reply

Not much UV through window glass.

Jo So

Oct 10, 2017, 7:30 pm Reply

Strange choice : why do you want to whiten this cover that perfectly matches the wall's beige color ?!?

Infinity Nexus Reviews

May 5, 2018, 9:39 pm Reply

Does anyone know if this works on clear plastic? I have a really yellowed see through lid on a turntable and I want to fix it

Fishy!Fishy!

May 5, 2018, 9:26 am Reply

My grand-uncle gave me a 50 year old car and has a brown windshield because it has been in the sun all day thank you :3

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