Coal was the shift from verse 2 wathi Scythe?) to put in the cups and tiles with aluminum foil, and then taken to the combustion temperature is 800° C stimulation for a period of 2 hours and leave to cool.
Bring coconut shell charcoal from 2) to put in a porcelain cup and wrapped with aluminum then calcined at a temperature of 800 ° C stimulated for 2 hr., And left to cool.
The coconut shell charcoal from the team 2) to put in the cup, tile and wrapped with aluminum and by burning activation 800 ° C for 2 hours. And leave to cool.