NOTE - I'm avoiding usin the terms UV, spot & varnish, to avoid confusion. A client has asked if I can print postcards with black light reactive print. So the post card is solid black with a single line of white text, then when a black light is held over it the content is revealed. First question has to be is black light ink a thing? How would it be applied? And.. Who can do it? I've though of having the cards printed then use a stencil and black light spay paint to add the information BUT that would fall down on areas of text.