How to determine whether the fluorescent dye is still effective
You can dye the dye to determine whether it is effective ah? General fluorescent dye dyeing, will show a bright color, more than the same color to light as long as you can dye, as long as the brightness , That is, no failure.
In general, regardless of fluorescent dyes or other dyes, as long as not reactive dyes and vat dyes, basically there is no failure problem.
