Section 77(9)(a) in The M.P. Factories Rules, 1962
(a)In every canteen-(i)all inside walls of rooms and all ceilings and passages and staircases shall be lime-washed or colour-washed at least once in each year or painted once in three years, dating from the period when last lime-washed, or painted, as the case may be;(ii)all wood work shall be varnished or painted once in three years, dating from the period when last varnished or painted;(iii)all internal structural iron or steel-work be varnished or painted once in three years, dating from the period when last varnished or painted provided that inside walls of the kitchen shall be lime-washed once every four months.