Section 12. Whoever, himself, or by his agent or servant, manufactures, sells or exchanges, or has in his custody or possession with intent to sell or exchange, any woven fabric or paper containing arsenic in any form, or any article of dress or household use composed wholly or in part of such woven fabric or paper, shall be punished by a fine of not less than fifty nor more than two hundred dollars; but this section shall not apply to articles intended for the destruction of insects, having the word ''POISON'' plainly printed in uncondensed gothic letters not less than one inch long on both sides of each sheet and square foot of the fabric, or to dress goods or articles of dress containing not more than one one-hundredth grain, or to other materials or articles containing not more than one tenth grain of arsenic for each square yard of the material. The department of public health shall make all necessary investigations as to the existence of arsenic in the aforesaid articles and materials, employ inspectors and chemists, and adopt such measures as are necessary to enforce this section.