According to the substrate processing method in the embodiments, as a mask substrate used for forming an EUV mask, a mask substrate in which a first film having a first hydrophilicity is formed on one main surface and a resist is applied to another main surface is exposed from a side of the resist. A primary component of a binary fire suppression agent is contained within the reservoir. A method of treating hair comprises applying the hair colorant composition to hair. The rotation stop is provided on the photosensitive drum. The changes in the files and directories are transmitted over the network for update of the replicated destination snapshot in an asynchronous manner. The glass strands obtained are used to reinforce polymer matrices for the purpose of manufacturing translucent composites, particularly panels for lightweight roofs.