How does the latex mask with nasal tube brace feel and how long is the nasal tube suitable?

The reason why people can see the color of an object is because the light of the luminous body shines on the object, the light radiates on the object, and the radiant energy of the light acts on the eyes. The color of a non-luminous object only appears when it is illuminated by light, and the color of the object is determined by the reflection and absorption of light on the object.