coating in the nature of tinting and photochromic treatment used in the optical industry to produce sunglasses and other specialty lenses

'coat':1 'industri':14 'lens':21 'natur':4 'optic':13 'photochrom':8 'produc':16 'specialti':20 'sunglass':17 'tint':6 'treatment':9 'use':10

photochromic sunglasses and other sunglass lenses

chemicals used for tinting and photochromic treatment in the optical industry to produce sunglasses and other specialty lenses

'chemic':1 'industri':11 'lens':18 'optic':10 'photochrom':6 'produc':13 'specialti':17 'sunglass':14 'tint':4 'treatment':7 'use':2

TRANSCHROMATIC

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