Regulation 4 Factories excluded from the Regulations
(1)
Nothing in these Regulations shall apply to a factory in which any of the following articles but no other pottery is made:—
(a)
unglazed or salt-glazed ware made from natural clay in the plastic state, to which no flint or quartz or other form of free silica is or has been added;
(b)
bricks glazed or unglazed;
(c)
architectural terra-cotta made from plastic clay and either unglazed or glazed with a leadless glaze only.
(2)
Nothing in these Regulations shall apply to the manufacture of potters' colours in a factory in which no pottery is manufactured or decorated.