The cationic dye may be chosen from azo dyes, azomethine dyes, methine dyes and xanthene dyes.
优选地，阳离子染料选自偶氮染料、偶氮甲碱染料、次甲基染料和？吨染料。
The meso carbon atom of the methine linkage of the dye is attached to the nitrogen atom of an amino group.
该染料的甲川链上的中位碳原子与氨基的氮原子相连。
Near-infrared cyanine dyes can be obtained by increasing length of conjugated methine chain in dye molecules.
菁染料光谱性能优良，可通过增加甲川链长度，获得近红外菁染料。
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