Esoth

I know this is an old topic but I'm trying to make sense of some set numbers from 80s/90s. I'm sorting my collection of instructions and the three lowest set numbers I have are 1477, 1480, and 1497. I would have assumed that set numbers were just sequential at with release but this does not appear to be the case - 1477 and 1480 are both from 1991 but 1497 is from 1987, at least according to bricklink. (Side note, I would have been 4 in 1987, I am surprised I still have it!)

I did some more reading and wavelength widths are mostly classified into UV-A, UV-B, and UV-C in order of lower to higher frequency. Sunlight is more likely to be absorbed by the atmosphere at higher frequencies so black light bulbs (UV-A) I would assume are a good bet. The effect is really a type of bleaching that is common to hair and other treatments. I'm really just looking at an alternative to natural sunlight because my townhouse's location and tree cover make natural sunlight hard to get. I've passed several bricks through many liters of H2O2 but the limited sunlight has left results minimal and somewhat sporadic. The idea of setting up a small tub under a black light sounds like it would offer more control. By the way, my understanding is the yellowing is a side effect of a chemical treatment TLG does to apply flame retardants. It is not poor quality so much as a compromise in conflicting values.

Hello, new to these forums! I've been trying to de-yellow my bricks with hydrogen peroxide and sunlight, but my townhouse's location makes the sunlight hard to achieve. I have tried regular electric light with minimal success so I'm under the assumption that the light from the sun is needed to be a higher frequency to achieve the desired effect. I'm no quantum physicist, but I'm assuming higher frequency light such as ultraviolet is needed for the desired effect. Would typically commercially available black light bulbs likely achieve the desired effect?