Build a UV-light box to restore discolored Lego

Apart from being dirty and sometimes warped, old bricks come with another handicap: they yellow over time. This is especially the case with white bricks and less so for grey and blue. It turns out this yellowing can be undone using hydro-peroxide and UV light. There are many video’s on YouTube showing how this can be done using sunlight. However, since The Netherlands is not the sunniest of places and since I did not want to be dependent on the availability of sunlight, I decided to build a UV light box to restore the color of my yellowed bricks. It uses 4 UV fluorescent tubes, 2 above and 2 below, and two Ikea transparent boxes to hold each 5 liters of 3% hydro-peroxide and the Lego bricks. Initially soaking for 3 hours with 30 minute stirs and after many batches up to 6 hours, with 1 hour stirring – the peroxide is re-used but concentration reduces over time – will do the trick.

4 Comments

    1. Hi! Thanks for your interest. Unfortunately I have no plans. Building one to sell would not be economical. The way I approached this was by starting out with buying two transparent boxes from IKEA and then design the box around it to match. It’s made from 9 mm birch plywood cut to size with a Makita track saw and guide rail (precise working required!) and then glue everything together. A table saw would be easier but at the time I did not have one. 4 UV florescent light tubes are fitted powered from one electronic device that is capable of feeding 4 tubes. I used two multi-core cables to power the tubes in the lid. I’ve the option of inserting the 2 bottom tubes in the lid also allowing the cabinet to be used for printed circuit board (PCB) fabrication. Haven’t used that option yet.

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  1. Hello, what wavelength are the bulbs you are using? I have a similar setup, but think my wavelength must be off. Thanks!

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