抄録
YAKE (pronounced yah-keh) is a general term for those deteriorated areas of a polished surface of glass which are different in reflectivity, scattering power and other optical properties from the mother surface. English word for YAKE would be STAIN(S) or TARNISHING. YAKE is classified into two categories, AOYAKE (ah-oh-yah-keh) and SHIROYAKE (shee-roh-yah-keh). The former denotes the stains, coloured often amber or purple by the interference of light, which actually are the patches on the glass surface where the refractive index is lower. The latter represents the white stains which are the patches where light is scattered by small particles of some kind of salt crystallites or by minute irregularities of the surface. Frequent outbreak of YAKE on lenses made of newer kinds of optical glasses, especially in the warm and humid summer season, has been an obstacle to the camera industry of Japan.
Experimental studies on YAKE artificially produced by immersion of glass in acid, alkaline, or neutral solutions will be described in this series of papers. Part I will be devoted to the synopsis of previous studies and to the description of the method of preparation of artificial YAKE. In Part II, detailed observation of the breath figures produced on stained glass surfaces will be described. (To be continued).
