 Use black light for better manual pretreatment?
Allow me to look at preatreatment with "beginner's mind." Seems that the invisibility of pt solution makes manual ptment riskier BECAUSE you can't see precisely how you laid down the solution. But if the solution were visible under a uv black light, perhaps quality manual application would be easier. SO: is pt visible under uv? (if not) could a uv visible color be added (invisible in normal light)?
Matt | 
