Abstract: Provided is a silica glass disc in which the deformation amount thereof in heat treatment is minimized, and the surface area of a silica glass surface can be increased. There is provided a silica glass disc, including a dimple forming area in which a large number of dimples are formed on at least one of a front surface or a back surface of a silica glass body, and the dimples in the dimple forming area are regularly formed. It is preferred that the dimples be formed by a laser.

Abstract: Provided are a quartz glass member with an increased exposure area, which has an increased exposure area to a film formation treatment gas as compared to a member having a flat surface and has the increased exposure area controlled so that a constant adsorption amount of the film formation treatment gas onto a surface thereof is achieved, a method for manufacturing the quartz glass member with an increased exposure area, and a blade with multiple peripheral cutting edges to be used for the method.

Abstract: A silver halide photographic light-sensitive material contains at least one negative-working silver halide emulsion layer composed of substantially surface latent image type monodispersed silver halide grains. The emulsion layer or another hydrophilic colloidal layer contains a compound of general formula I or II: ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents a hydrogen atom, or a substituted or unsubstituted alkyl or aryl group, and if one of R.sub.3 and R.sub.4 is a hydrogen atom, the other thereof is not a hydrogen atom. Disclosed also is a process which forms a photographic image by employing the material as described above, or a developer containing the compound as shown above.