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About kat-knapp

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  1. kat-knapp


    Thank you @TeriXeri @Grover @62Bricks All of your responses were very helpful. I am using only glass containers but I think it was just in the sun too long this time or rather too long in our Florida summer sun vs. the shorter cooler winter sun when I did it last. I'll be more careful next time. I'll keep these separate and see if they revert back after awhile and post if they do. Thanks, kat-knapp
  2. kat-knapp


    This question is for @Grover I have been brightening Legos for years now with Hydrogen Peroxide with good success. I submerge the Lego pieces in a glass container with a glass sheet covering to keep the Legos under the solution top. I started with 3 to 4 hours at first but over the years have found that a full two 8 hour days gets the best results. I recently ran into a problem, though. Using the same concentration (3%) hydrogen peroxide solution, same container, and same time length in the sun (2 days) I ended up with over "bleached" bricks. I was working on an old gray (pre 2004) batch. They are now mottled gray with very light gray patches and some are almost white. Even weirder is that a small handful stayed the original old gray. Since the Lego is the same color all the way through I did not think this was possible. I have heard/seen where an edge of a Lego brick that is not properly submerged will have a whiter demarcation for the bit above the liquid (I forget the technical term for this) but this happened to most of the pieces even those totally submerged. Obviously, there are some Lego overlap patterns but I don't think that caused the bleaching. I try not to crowd them but if they have overlapped/touched in the past the worst case was a spot where the yellowing was not removed and the Lego piece had to be redone. As a chemist, can you think of a reason this happened? Or, any way to reverse this. I hate to throw away 1 lb of old gray parts as they are getting harder to come by. Thanks, kat-knapp