(1704) And if one observed it in the fracture through the magnifying glass , one would imagine more than before that the numerous very small gleaming particles that one saw were really metal particles .But when I put the broken fragment in the fire , and tried to keep the expelled smoke together as well as I could , it became evident to me that it was almost nothing but sulphur , for not only did the smell manifest this , but the expelled sulphur had as yellow a colour as we see on sulphur with the naked eye ..