flashjazzcat Posted March 22, 2009 Share Posted March 22, 2009 The sun went away!!! It's really cloudy today, so I can't do anything more until next weekend. Anyway, you can see from these pictures that the light grey is starting to show through after less than two hours' exposure. The badge is also taking a bit of a hammering, so I might look into getting a new one (a 1040ST one because it'll be upgraded by then). There's a really bad strip of green discolouration at the front edge of the bottom half of the case which is going to take lots of work: Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 28, 2009 Share Posted March 28, 2009 I went into a local beauty shop and discovered those developer products. I notice the ratio seems to be 40vol=12%, 30vol=9% and so on. What do they base that unit conversion on? Anyway, should I just get the pre-thickened stuff in 40 vol? -Bry Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 28, 2009 Share Posted March 28, 2009 Anyway, should I just get the pre-thickened stuff in 40 vol? The pre-thickened 40 vol peroxide is what I've got and it's worked really well so far (after only 90 minutes of exposure; no more sun since then!). I had added cornflour and oxy, but next time I might just try painting the thick peroxide onto the case as is and see how that goes. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 29, 2009 Share Posted March 29, 2009 (edited) Sunlight's out in force today! Hopefully I'll get the ST done and post some photos later. ...damn. I just noticed that the peroxide has bubbled the paint on the case badge. I'll need a new badge from somewhere. Edited March 29, 2009 by flashjazzcat Quote Link to comment Share on other sites More sharing options...
+poobah Posted March 29, 2009 Share Posted March 29, 2009 I went into a local beauty shop and discovered those developer products. I notice the ratio seems to be 40vol=12%, 30vol=9% and so on. What do they base that unit conversion on? Anyway, should I just get the pre-thickened stuff in 40 vol? -Bry Chemistry was a while ago, but I think vol solutions describe how much solute (by volume) was added to produce a given volume of the resultant solution. ie: if you used 40 ml of H2O2 to produce 100ml of the resulting solution, it would be a 40 vol solution. I'm sure there an STP assumption here too. (remember that in chemistry 40ml of A + 60ml of B doesn't necessarily equal 100ml) Then again, I could be completely wrong on this one =P Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 29, 2009 Share Posted March 29, 2009 Keyboard's done; case is still in the garden... Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 29, 2009 Share Posted March 29, 2009 I went into a local beauty shop and discovered those developer products. I notice the ratio seems to be 40vol=12%, 30vol=9% and so on. What do they base that unit conversion on? Anyway, should I just get the pre-thickened stuff in 40 vol? -Bry Chemistry was a while ago, but I think vol solutions describe how much solute (by volume) was added to produce a given volume of the resultant solution. ie: if you used 40 ml of H2O2 to produce 100ml of the resulting solution, it would be a 40 vol solution. I'm sure there an STP assumption here too. (remember that in chemistry 40ml of A + 60ml of B doesn't necessarily equal 100ml) Then again, I could be completely wrong on this one =P So, 40% by volume is 12% by weight? Hmnmm... what's the density of H2O2... 1.44 g/cm3 (H2O2) vs. 0.998 g/cm³ (H2O) so H2O2 is more dense so that doesn't work. Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 29, 2009 Share Posted March 29, 2009 ...damn. I just noticed that the peroxide has bubbled the paint on the case badge. I'll need a new badge from somewhere. I wonder if it was any of the other thickening ingredients that affected the paint. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 29, 2009 Share Posted March 29, 2009 (edited) I've got to say I'm disappointed with the result after tending to the case all day today: The warm grey I thought was the base colour (and which actually looks quite finished on the bottom of the case and on the grille area) obviously isn't. There are much lighter, more bluey-grey areas starting to show through, making the case look very blotchy. This is obviously going to be a long process. To bring the whole case back to the lighter blue-grey colour (which is only visible on about 10% of the surface at the moment) is going to take another 2-3 whole days' work. That means 2-3 Sundays, which means 2-3 weeks. ...Moreover, the lighter grey isn't showing through on the bottom half of the case at all: the underside is an even, warm grey. Both halves of the case have received identical treatment, but it's almost as if they're made of different plastics. They're reacting differently, as if the areas which were the most discoloured in the first place are bleaching more intensely than the areas that weren't too bad. The results are very unsatisfactory; it almost looks worse than it did to begin with. I'm not sure how to proceed here. As I say, there's not a trace of the lighter grey on the underside of the case (which actually looks quite nice). Edited March 29, 2009 by flashjazzcat Quote Link to comment Share on other sites More sharing options...
+poobah Posted March 29, 2009 Share Posted March 29, 2009 I went into a local beauty shop and discovered those developer products. I notice the ratio seems to be 40vol=12%, 30vol=9% and so on. What do they base that unit conversion on? Anyway, should I just get the pre-thickened stuff in 40 vol? -Bry Chemistry was a while ago, but I think vol solutions describe how much solute (by volume) was added to produce a given volume of the resultant solution. ie: if you used 40 ml of H2O2 to produce 100ml of the resulting solution, it would be a 40 vol solution. I'm sure there an STP assumption here too. (remember that in chemistry 40ml of A + 60ml of B doesn't necessarily equal 100ml) Then again, I could be completely wrong on this one =P So, 40% by volume is 12% by weight? Hmnmm... what's the density of H2O2... 1.44 g/cm3 (H2O2) vs. 0.998 g/cm³ (H2O) so H2O2 is more dense so that doesn't work. Found a reference. I was close, correct on the vol and solution, wrong on the solute - its oxygen in water, not H2O2 in water. A 3 percent solution of H2O2 will release 10 volumes of oxygen as it decomposes to water and oxygen gas. ie 100ml of 3% (10 vol) H2O2 produces 1000ml of O2 - STP applies, naturally Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 29, 2009 Share Posted March 29, 2009 I have a nasty feeling that what I can see is "blooming", where the peroxide has attacked the plastic. Looks like I've messed it up. Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 29, 2009 Share Posted March 29, 2009 I have a nasty feeling that what I can see is "blooming", where the peroxide has attacked the plastic. Looks like I've messed it up. Have you tried the Magic Eraser trick to see if any of it comes off? Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 30, 2009 Share Posted March 30, 2009 Have you tried the Magic Eraser trick to see if any of it comes off? Thanks! I tried a little nail polish remover on a soft cloth and thankfully that's brought it all off. Rubbing gently then dabbing the cloth can achieve a matte, mottled texture akin to the original. I'll fine-tune it tonight and post some pictures. It looks pretty good now. Quote Link to comment Share on other sites More sharing options...
JamesD Posted March 30, 2009 Share Posted March 30, 2009 Nail polish remover contains Acetone which melts plastic so be careful with it. Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 30, 2009 Share Posted March 30, 2009 Nail polish remover contains Acetone which melts plastic so be careful with it. Right. If the discoloration is just something on the surface, I'd find the mildest way to remove it. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 30, 2009 Share Posted March 30, 2009 (edited) Nail polish remover contains Acetone which melts plastic so be careful with it. Right. If the discoloration is just something on the surface, I'd find the mildest way to remove it. Absolutely. Various mild abrasives weren't doing any good, but obviously the acetone - when judiciously applied - is removing the uppermost layer of the plastic. It's the technique I first tried on the Atari 8 keyboard but unfortunately it brought the letters off with it! In any case, I'm finishing off the ST with a magic eraser. As disaster management goes, it's been relatively successful. ...and a photo. I'm quite happy with it now. Edited March 30, 2009 by flashjazzcat Quote Link to comment Share on other sites More sharing options...
mimo Posted March 31, 2009 Author Share Posted March 31, 2009 looks good to me. Glad you limited the damage. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 31, 2009 Share Posted March 31, 2009 looks good to me. Glad you limited the damage. Me too. One last pic in natural light with the new badge: Quote Link to comment Share on other sites More sharing options...
pinball22 Posted March 31, 2009 Share Posted March 31, 2009 That looks nice, flash. I almost bought an SNES at a flea market the other day just because it was horribly yellowed and I wanted to try this. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted March 31, 2009 Share Posted March 31, 2009 That looks nice, flash. I almost bought an SNES at a flea market the other day just because it was horribly yellowed and I wanted to try this. Thanks. For a first effort, strewn with mistakes, I'm happy with it. It's just a shame I had to test my mistakes out on the ST! Next up is a badly yellowed but fully working Brother Laser Printer which I got for nothing. Buying something to try it on is a good idea. For people thinking of doing this to valued items, just be careful. Read the Wiki carefully, be aware of the pitfalls, mix the ingredients in the right proportions (NOT too much OXY, for example), rinse and check the parts regularly, and don't let the solution dry out (ideally, probably best to keep parts covered in clear polythene or something). When I first put the ST out for only 90 minutes, I mistook early blooming for the original colour coming through. I then inflicted another eight hours of the same kind of damage. The colour change, I would now say, should be even and blotch-free. I had a very lucky escape with the ST: It was a bargain and I've since invested a fair bit of cash in it and ruining it through lack of knowledge or preparation would have been nothing short of tragic. Quote Link to comment Share on other sites More sharing options...
w1k Posted April 2, 2009 Share Posted April 2, 2009 hello.. i try use 3% hydrogen peroxide and vanish (no oxi) two keys, two days.. no good what i can try? can u use 30% hydrogen peroxide + sodium hydroxide? or 30% peroxid and vanish oxi? Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted April 2, 2009 Share Posted April 2, 2009 (edited) hello.. i try use 3% hydrogen peroxide and vanish (no oxi) two keys, two days.. no good what i can try? can u use 30% hydrogen peroxide + sodium hydroxide? or 30% peroxid and vanish oxi? I'd guess 3% is a little weak. I was using the 12% peroxide gel (available from hairdressers' suppliers) with a dash of Oxy. The keys showed a clear improvement after only a couple of hours. You probably want to have the keys face up to the light source as well. Edited April 2, 2009 by flashjazzcat Quote Link to comment Share on other sites More sharing options...
w1k Posted April 2, 2009 Share Posted April 2, 2009 can i buy VANISH OXI? where i can found OXY? (im from slovakia) Quote Link to comment Share on other sites More sharing options...
mimo Posted April 3, 2009 Author Share Posted April 3, 2009 can i buy VANISH OXI? where i can found OXY? (im from slovakia) Vanish Oxi will be fine, maybe just a name change for your market. Quote Link to comment Share on other sites More sharing options...
w1k Posted April 3, 2009 Share Posted April 3, 2009 ok.. how do i make that my buttons in the solution of turning upside down? Quote Link to comment Share on other sites More sharing options...
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