Patent ID: 7972398

Claim:
A polishing composition for a glass substrate having a pH of from 1 to 5 and comprising silica particles having an average particle size of from 5 to 100 nm, wherein, in a projected image of the silica particles obtainable by an image analysis of electron photomicrographs, an average of an area ratio R of a projected area of the silica particles (A1) to an area of a maximum inscribed circle of the silica particles (A), i.e. (A1/A), is in the range of from 1.2 to 3.0, and the silica particles have an average of 2.0 to 10 projection portions extending from the surface of the projected image, having a curvature radius of from ⅕ to ½ of a radius of the maximum inscribed circle of the silica particles (r) on the outline of the silica particles in the projected image.