Infrared dyes having an infrared absorption maximum above 1130 nm are disclosed which have minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.
揭示了具有红外吸收最大波长超过1130纳米的红外
染料,这些
染料在可见光谱中具有轻微的着色。这些红外
染料特别适用于制作多彩激光标记的安全文件,减少背景色彩并增强色彩范围。