Section 67(8)(a) in The West Bengal Factories Rules, 1958
(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 shall be varnished or painted once in three years dating from the period when last varnished or painted: