| 摘要 |
A mount for spectacles wherein at least one part of same is covered by a heat-sensitive material, normally opaque and capable of becoming transparent when a thermal colour change threshold is exceeded, comprises, at the at least one part, at least one symbol (5a-5g; 9) covered by the heat-sensitive material such as to be normally concealed by the latter when it is opaque and visible through it when the colour change temperature corresponding to the thermal threshold is reached. |
