Blue dye kinda sucks for the tests bc you get evap lines and sometimes it gives you false positives :( and these are the blue dye, you can google it in pictures here is the link it will show you :) https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1152&bih=701&q=clear+blue+plus&oq=clear+blue+plus&gs_l=img.3..0l2j0i10l2j0j0i24j0i10i24j0i24j0i10i24j0i24.1784.3486.0.4777.15.12.0.2.2.1.199.1270.6j6.12.0....0...1ac.1.26.img..3.12.945.G7JljMWjnJ0