Solution comprising about 1 to about 25 wt % of a dye that loses its colour during radical cure and about 75 to about 99 wt % of a solvent mixture, said solvent mixture comprising cyclopentanone and dimethylsulphoxide in a weight ratio of about 60:40 to about 95:5.
溶液,包括约 1 至约 25 重量%的在自由基固化过程中失色的
染料和约 75 至约 99 重量%的溶剂混合物,所述溶剂混合物包括重量比约为 60:40 至约 95:5 的
环戊酮和
二甲基亚砜。