Show mantle rays penetrate thoro there aro are X rays and N rays and thero there are also from those mantle things that you put on gas burners to improve the light the speaker a photographer pointed to a batch of fogged plates 1 I know to my cost coat that there are mantle rays sold said ho he for a month I 1 stored now platea in a closet along with a mantro and all of thorn got fogged tile the mantle you seo see contains cont alna thorium th orlum a active substance that pene a cardboard plate box as aa easily OB as it pone abates glass I 1 alt know that till my iny doctor told tile mo so BO recently my ignorance cost wo uio over pl plates ittes |