| The cooperating producers of optical brighteners use either pure grade sulphanilic acid or pure grade in a salt solution. |
| It is used in the manufacture of optical brighteners, additives for concrete and speciality dyes and colorants. |
| Blue liquid blend of anionic and nonionic surfactants, soil suspending agents, odour neutralisers and optical brighteners. |
| If organics appeal, Sukispa's targeted bio-brightening serum packs all manner of herbal brighteners into one teeny jar. |
| I have read that long wash times can leach out optical brighteners, but I've never been able to tell the difference between 2 and 6 hours in a cold wash. |
| See? Waggish Samurai, built for the ages, goes gushy puppy dog for brighteners. |
