**7. Effect of temperature**

Surrounding temperature influence the performance of photochromic dyes. The bleaching effect of photochromic dyes are accelerated by the temperature of sample [38–40]. Dulic et al. find that ring opening process of diarylethene is temperature dependent whereas ring closing process shows only slight dependence. Ortica [41] reviewed the effect of temperature on the characteristics of various photochromiv materials such as spirooxazines, chromenes and arylethenes, which are as follows,


**Figure 8.** *Photochromic reactions of diarylethenes.*

#### *Photochromic Dyes for Smart Textiles DOI: http://dx.doi.org/10.5772/intechopen.96055*

