Photochromic liquid coating systems comprised of one or more of a primer coating composition, a photochromic coating composition, and an abrasion-resistant hardcoat coating composition for use in applying to plastic or glass substrates that, when cured, will darken or change color, or both, when exposed to ultraviolet light and return to the prior clear or color-free state when the ultraviolet light is removed

'abras':22 'abrasion-resist':21 'appli':30 'chang':42 'clear':56 'coat':3,13,17,25 'color':43,59 'color-fre':58 'composit':14,18,26 'compris':5 'cure':38 'darken':40 'expos':47 'free':60 'glass':34 'hardcoat':24 'light':50,65 'liquid':2 'one':7 'photochrom':1,16 'plastic':32 'primer':12 'prior':55 'remov':67 'resist':23 'return':52 'state':61 'substrat':35 'system':4 'ultraviolet':49,64 'use':28

Equipment, namely, electronic instrument for measuring photochromic performance of photochromic liquid coating systems

'coat':12 'electron':3 'equip':1 'instrument':4 'liquid':11 'measur':6 'name':2 'perform':8 'photochrom':7,10 'system':13

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