| 摘要 |
<p>There are herein disclosed calcined pencil leads which have a high strength, excellent light resistance and weathering resistance as well as a sharp color and which can easily be erased by an eraser, and a method of manufacturing the calcined pencil leads. In the calcined pencil leads containing, as at least a colorant, a pigment obtained by forming the pigment in the open cells of the pencil leads, the pigment can be obtained by any of (1) a process of impregnating the open cells with a solution containing the dissolved organic pigment, and then solidifying the pigment, (2) a process of impregnating the open cells with a solution containing a pigment precursor, and then reacting it, and (3) a process of impregnating the open cells with a dye solution, and then forming a lake.</p> |
