11. If it be necessary to distinguish the stamps which are issued for any special fund or purpose from those which are applicable to the consolidated revenue fund of Québec, the Lieutenant-Governor may direct by order-in-council that such distinction be made and observed in such manner, and by such means or differences in the lettering or numbering, or in the colour or form, or otherwise, of the stamps, as he may find or consider necessary or expedient.
R. S. 1964, c. 80, s. 12.