A ceiling tile and a method of manufacture, wherein the ceiling tile has contrasting colors of texturized woven yarn and a coating, respectively, wherein individual colors of the yarn and coating are at different depths of surface texture, wherein color contrasts accentuate the surface texture depths to be viewed, and provide a desirable, unpredictable randomness of pattern of the color contrasts. The auto-sampler cleaning mechanism of the present invention includes: a sample-metering sample loop 14 having a sample-injecting needle 15 at a front end thereof, a metering pump 24, a multi-ported valve 11a, a multi-position valve 11b, and a liquid-supply valve 11c. The photoresist layer includes copolymers prepared from styrene, acrylonitrile, and epoxy-containing monomers. The assembly can comprise an inner container in which the source chemical is contained. By using photomodulation resulting from cellular responses to exposure to specific wavelengths of light, optionally in conjunction with topical compositions and procedures for enhancing the penetration of such compositions, hair follicles are activated to produce hair growth.