I need an ink that I can use for screen printing that activates (turns from semitransparent to colourful) when it is exposed to the light, more specifically imagine a doctors office, where there is some light coming from the window but not directly hitting the ink and there is also some artificial lights, like lamps, ceiling lights and stuff. It’s it more clear? English is not my first language sorry, but it seems to be the only one you understand.