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A Brief History of Optical Coatings   by Tracy

In 1892, Taylor from United Kingdom,(HD Taylor's famous Cook, designer of Triplet lens) found that, the surface of burnt telescope by weathering turns to purple.Comparing with the new lens ,it is found that more light can be through. There is low refractive coatings Zinc oxide on the glass which is eroded by the weak acid, it can reduce the reflectivity of the glass surface.
This new discovery about burning lens makes people know the coatings' function and produces coating technology, the future use of chemical workers in weak acid, weak acid from the laboratory-generated surface gel layer, to 1930 or so, technology has been significantly progress. 1931: â