1890 - 1910ish tenement close plaster?

Evening hivemind. Looking to complete some DIY repairs in our close as some clumsy people (naming no names... but me) have taken gouges out of the walls. Does anyone know what type of plaster would have been used in a 1890 to 1910ish blonde sandstone tenement? I presume it's a lime mortar (hydraulic? Non-hydraulic?) but would like a second opinion.