Black silicon carbide simple way to identify what

In fact, distinguish black silicon carbide method is very simple, generally can tell from the color on the out, but some are dyed , and this time we should better understanding and from the other side to compare .
Black silicon carbide simple identification method :
Color difference compared with green silicon ; hardness, it is much harder than glass , can be used when the glass cutter ; find a glass container , put the pieces into a certain amount of silicon carbide , add water , shake , look at its turbidity , AGUA black , indicating its higher carbon , silicon carbide abrasive , but less ; the water drained , watching the black silicon carbide in the quartz sand how many unfired raw numbers , and thus make a preliminary judgment, if you engage in over- testing , your judgment will not be up and down the error 3 . There you look at the density of silicon carbide , silicon carbide and high chamber generally loose content is higher than the number .