Preparation of photosensitive color-producing microcapsules utilizing in situ polymerization method was written by Sawada, K.;Urakawa, H.. And the article was included in Dyes and Pigments in 2004.Name: Crystal violet lactone This article mentions the following:
The photosensitive color-producing microcapsules were prepared from melamine/formalin resin by in situ polymerization method. The leuco-compound and the photoacid generator dissolved in diisopropylnaphthalene were successfully loaded in the interior of microcapsules. Preparation of microcapsules that have uniform particle size could also be attained. Irreversible development of microcapsules was examined by an irradiation of UV light. The leuco-compound in the microcapsule was sensitively reacted with the acid produced from the photoacid generator without destruction of capsule walls. It has also been found that the development in the microcapsule progresses quickly compared to the bulk condition. In the experiment, the researchers used many compounds, for example, Crystal violet lactone (cas: 1552-42-7Name: Crystal violet lactone).
Crystal violet lactone (cas: 1552-42-7) belongs to benzofurans derivatives. Benzofuran derivatives have shown many biological activities, including antifungal and antimicrobial properties, and acting as antagonists of H3 receptors and angiotensin II. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Name: Crystal violet lactone
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem