Do not rely on the light if vulnerable to sunlight, to save the work because it is dye-based paint. The Indian non-black liquid, ink is water-resistant to complete drying after. You can enjoy the various colors in overspray Taking advantage of clarity also mixed color other than from such properties, and mix the ink to each other. Here are the beauty of this ink, transparency is well known. how to use, you can put the pen tip, I use it as watercolors