English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 29 March 2020, 10:25   #1181
VresiBerba
Registered User
 
Join Date: Dec 2009
Location: Sweden
Posts: 86
Only have liquid peroxide and no bin big enough for the object. Would gelatin powder work to gel it up?
VresiBerba is offline  
Old 29 March 2020, 12:20   #1182
demolition
Unregistered User
demolition's Avatar
 
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 40
Posts: 4,144
Quote:
Originally Posted by VresiBerba View Post
Only have liquid peroxide and no bin big enough for the object. Would gelatin powder work to gel it up?
Corn starch works so I don't see why gelatine shouldn't work as well. Common for both is that it requires heating up the peroxide which is potentially dangerous. Take precautions to only heat it up sufficiently to activate the thickener and avoid any bubbling/splashes of the peroxide. Being a strong oxidizer, it is corrosive for metals and if you get it into an eye, you could easily go blind.
demolition is offline  
Old 22 April 2020, 04:29   #1183
ReadOnlyCat
Code Kitten

 
Join Date: Aug 2015
Location: Montreal/Canadia
Age: 49
Posts: 1,176
Quote:
Originally Posted by turrican9 View Post
I have seen 8bit guys method.

The thing is it's almost impossible to find liquid peroxide or even cream peroxide in Norway. They simply do not sell it to regular persons. The cream peroxide I have was ordered from England. It was a hairdresser cream to bleach hair. I believe it's not legal to sell in Norway. Another thing is that even If I had liquid peroxide and a huge box to submerge something like an A500 case we have almost no sun. North of Norway here. The summers are short and the sun not very strong. Unlike you who live in Australia and have plenty of strong sun and probably easy access to liquid Peroxide

And finding other ways to heat up a big box of water and peroxide like that is not easy.
Pure peroxide is a dangerous explosive liquid and is rarely available in mainstream shops and although it can be obtained in speciality shops you usually have to leave a proof of identity and address for police records since it can be used to build powerful explosives.

What you want is definitely not pure peroxide but diluted versions and those are the ones available to regular kittens. You can most certainly find some in pharmacies alongside Isopropyl Alcohol since this is an excellent disinfectant.

I would moreover recommend pharmacy peroxide over the hair-related solutions since these probably include additional undesirable chemicals.
Peroxide, when sold as a disinfectant is only diluted by water and nothing else, making it perfect for retrobriting (if you buy several liters).

This said, as many others have said, sunlight/UVs alone seem to work just fine.
ReadOnlyCat is offline  
Old 14 July 2020, 19:59   #1184
Radertified
Registered User
 
Join Date: Jan 2011
Location: -
Posts: 482
I'd love to hear some updates about this. It's been over 10 years since people started retr0brighting.

To anyone that did this a decade ago:

- Has your item yellowed again? If so, is it worse than original? About the same? Patchy?
- How brittle has your item become? Same as before or worse? (I doubt it'll get better)
- What method did you use? Soak, paint on, etc.

Photos for bonus points
Radertified is online now  
Old 14 July 2020, 20:06   #1185
Washac
Junior Member
Washac's Avatar
 
Join Date: Oct 2001
Location: UK Southern End
Posts: 678
Quote:
Originally Posted by Radertified View Post
I'd love to hear some updates about this. It's been over 10 years since people started retr0brighting.

To anyone that did this a decade ago:

- Has your item yellowed again? If so, is it worse than original? About the same? Patchy?
- How brittle has your item become? Same as before or worse? (I doubt it'll get better)
- What method did you use? Soak, paint on, etc.

Photos for bonus points
From all the science I have read on this the yellow does come back all be it not
as bad, and the science and chemicals in the Retrobright ( Retr0bright )
process used apparently causes the plastic to turn brittle.

I see the yellowing as part pf the machines history, and it does not really worry
me too much, and the above is why I have never used the process.
Washac is offline  
Old 14 July 2020, 20:26   #1186
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,320
In my experience the process works well, but the yellowing does tend to return to some degree. Using a method where the part is fully immersed in liquid is safest; if the peroxide is allowed to dry the result will be blotchy. Treating colorful parts is a bit hit and miss as to how the dyes react, I'd limit myself to beige Amiga and Commodore stuff unless there is an opportunity to do a test piece first.

I haven't noticed any increase in brittleness with the parts I've done - as far as I can tell only the very surface is effected. However, many of these old parts are certainly brittle to begin with.
ajk is offline  
Old 14 July 2020, 20:31   #1187
necronom
Registered User
necronom's Avatar
 
Join Date: Jul 2010
Location: Middlesbrough
Posts: 85
Here is an update from my A500.

Original post in Oct 2011
http://eab.abime.net/showpost.php?p=...&postcount=655

A pic I've just taken of the same A500


If the pic above doesn't appear, then here is a link: Click here

Even though the lighting and camera settings are different, you can at least see that it's still looking very good. I sprayed it with satin finish clear coat afterwards (which isn't noticeable).

I used the liquid peroxide/oxy mixture.

Last edited by necronom; 15 July 2020 at 11:23. Reason: fixed the image url
necronom is offline  
Old 15 July 2020, 11:13   #1188
Methanoid
Retired Quartex Sysop
Methanoid's Avatar
 
Join Date: Sep 2001
Location: Roman Verulamium
Age: 55
Posts: 1,796
Quote:
Originally Posted by necronom View Post
Here is an update from my A500.

Original post in Oct 2011
http://eab.abime.net/showpost.php?p=...&postcount=655

A pic I've just taken of the same A500


Even though the lighting and camera settings are different, you can at least see that it's still looking very good. I sprayed it with satin finish clear coat afterwards (which isn't noticeable).

I used the liquid peroxide/oxy mixture.
Neither post has a picture
Methanoid is offline  
Old 15 July 2020, 11:27   #1189
necronom
Registered User
necronom's Avatar
 
Join Date: Jul 2010
Location: Middlesbrough
Posts: 85
That's odd. They all appear for me and are just direct links to the jpg files. I've added links below the pics to click on.
necronom is offline  
Old 15 July 2020, 11:39   #1190
Methanoid
Retired Quartex Sysop
Methanoid's Avatar
 
Join Date: Sep 2001
Location: Roman Verulamium
Age: 55
Posts: 1,796
Quote:
Originally Posted by necronom View Post
That's odd. They all appear for me and are just direct links to the jpg files. I've added links below the pics to click on.
LOL BOTH show now.. strange!
Methanoid is offline  
Old 15 July 2020, 18:14   #1191
Washac
Junior Member
Washac's Avatar
 
Join Date: Oct 2001
Location: UK Southern End
Posts: 678
I.m getting Bad Gateway Error on both links.
Washac is offline  
Old 08 October 2020, 02:34   #1192
Lektroid
Registered User
Lektroid's Avatar
 
Join Date: Aug 2020
Location: UK
Posts: 76
Best method I've found, use Clairol Pure White 40, it has everything you need perfectly mixed. Use a paintbrush to apply, wrap item(s) in clingfilm to prevent evaporation. Pick a day with clear skies, and choose the room with the most sunlight, stand items in the window from the moment the sun comes into the room until it goes away. Heat is essential to aid the process. Also when sunlight isn't available (around 364 days per year in Scotland) I found the source that caused the damage is the best source to reverse it, ie if prolonged use of a fluorescent lamp was the catalyst for the bromine to react (which causes the yellowing), then reverse it with a fluorescent lamp.

As for patchy results, this is usually caused by the retrobrite evaporating in certain areas quicker than others. Just re-coat, re-wrap and do another session. Also, despite a common myth, I've never managed to over-retrobrite anything.
Lektroid is offline  
Old 26 October 2020, 13:11   #1193
bartekmalysz
Registered User

 
Join Date: Oct 2020
Location: Northwich, UK
Posts: 38
I had a badly yellowed C128d keyboard, used 6% hydrogen peroxidefrom amazon, 2 x 30w UV 365-395 nm lamps and it took 48h. The result isn't the best, but the enemy of good is better.
Attached Thumbnails
Click image for larger version

Name:	20200907_180642.jpg
Views:	130
Size:	623.2 KB
ID:	69502   Click image for larger version

Name:	20200907_180622.jpg
Views:	129
Size:	892.1 KB
ID:	69503   Click image for larger version

Name:	20200909_110911.jpg
Views:	150
Size:	587.5 KB
ID:	69504  
bartekmalysz is offline  
Old 27 October 2020, 10:55   #1194
Methanoid
Retired Quartex Sysop
Methanoid's Avatar
 
Join Date: Sep 2001
Location: Roman Verulamium
Age: 55
Posts: 1,796
Quote:
Originally Posted by bartekmalysz View Post
I had a badly yellowed C128d keyboard, used 6% hydrogen peroxidefrom amazon, 2 x 30w UV 365-395 nm lamps and it took 48h. The result isn't the best, but the enemy of good is better.
Looks pretty good to me
Methanoid is offline  
Old 03 January 2021, 13:31   #1195
Jolabandola
Registered User

 
Join Date: Oct 2019
Location: Nordmaling/Sweden
Posts: 50
I am about to try retrobrighting my very mustard yellow A1200 and also the Keys.
I am doing the full immersion type. I have found a large plastic container and ordered about 4 litres of 12% liquid peroxide. Next up is buying some uv lamps.
Hope this goes well.

Edit: I am now finished and the result is way better than What i expected. It looks brand new. I ordered 8 liters of hydrogen peroxide. I found a large 55l container that i wrapped in aluminumfoil around the outside. I had to attach a heavy spanner under the chassie to keep it submerged and I had it in there and under uv-light for about 24 hours. Same thing for the keycaps. I just poured them in and turned them upside down and let them float around in the peroxide for 24 hours.
This is a very good way to go since i was afraid of marbling.

Last edited by Jolabandola; 19 January 2021 at 14:01.
Jolabandola is offline  
Old 22 February 2021, 14:01   #1196
SALLEN0710
Registered User

 
Join Date: Jan 2021
Location: Braintree
Posts: 4
I'm just getting ready to try this myself, I think I've everything I need, 12% peroxide, full spectrum LED (Banggood special), foil and a container. I think I'll try the keycaps first.

[IMG]https://drive.google.com/file/d/1Sc-...ew?usp=sharing[/IMG]

Last edited by SALLEN0710; 22 February 2021 at 14:03. Reason: Trying to add an image
SALLEN0710 is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
A500+ Colour / Yellowing? craggus2000 support.Hardware 25 22 November 2010 10:24
Removing Yellowing using H2O2, TAED & UV alexh support.Hardware 31 22 February 2010 00:48
Guide to removing yellowing of plastics tonyyeb support.Hardware 38 28 November 2009 20:23
Partial yellowing? Akira support.Hardware 21 04 July 2008 01:46
Yellowing BippyM support.Hardware 56 03 January 2003 21:08

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 18:44.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.11923 seconds with 16 queries