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That is, until the Fritaire air fryer, with its glass chamber and self-cleaning function.

In the lab and in experiments under open skies under real outdoor conditions, the researchers tested the material's properties and measured its light transmittance, light scattering, reflection properties, self-cleaning ability, and cooling performance using modern spectrophotometry.

This self-cleaning function makes the material easy to maintain and durable.

Another challenge addressed by the team is the impurities fluids leave behind in the textures of rough surfaces, posing challenges for self-cleaning.

In practice, however, this is of little use -- after all, it would be tedious to repeatedly irradiate the wall with intense UV light in order to drive the self-cleaning process.