In recent years, environmental issues, including green building
materials, have been a topical subject. Color-changing green
building materials can enhance the willingness to use and beatify
the green buildings. According to related regulations in Taiwan,
the usage rate of indoor green building materials shall be higher
than 45% of the total area, and that of outdoor materials shall be
higher than 10%. This suggests that the use of green building
materials is widely accepted. Lin [12] added printing paste in
thermochromic microcapsule prints, and used temperature change
to display the human imprint, called ‘‘body symbols’’. Huang [7]
combined thermochromic pigments with electrothermal textiles