photochromic painting1 (polymer).AVI

[lekunberriko1]

Please, could you tell me what light is it?

[PHOTOCHROMISM]

@lekunberriko1 UV light irradiation was performed by a UV-LED (Keyence UV-400) , which is commercially available from Japanese company.

[diviz0r]

somehow this reminds me off invisible ink. lemon juice on paper is clear but once held under fire or warmth it turns brown.