花青染料(cyanine)為鹽性基染料，因顏色鮮豔、染色容易，早期為紡織業所用。在十八世紀末被人發現有特殊感光性質，因此可作為彩色底片的感光乳化劑。此外，因儲存資料的快速演變，已由原本的手寫記載演變成現今的光學記載，而光學材料中光敏感之塗料(色料)，以花青染料(cyanine)染料為主。
花青染料(cyanine)的種類很多，大部分是由

The cyanine belong to base dyes. In the early stage because of they have high tinctorial power and easy to dye, they were used as textile dyes. In the end of 18 century, it was first discovered that cyanine dyes had photosensitive properties; therefore they could be used as photographic emulsions. Besides, owing to record storage of the information are changed fast, the memory type was transferred from written by hand to optical storage. The optical material is photosensitive dyes (colorants). The dyes were almost used as cyanine.
There is much kind of cyanine dyes; the most of cyanine are constitute by quinoline. They are divided into merocyanine、isocyanine、aza methine cyanine etc.
In this study we use r-picoline that is made for r-picolinium salts then condense with aromatic aldehydes、triethyl orthoformate、1,1,3,3-teramethoxypropane and aromatic nitroso compound in isopropanal-piperidine. Finally we discuss on the characteristic of the synthetic dyes and find out these optimized conditions

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