public void ignite(MOB mob, Item I)
	{
		int durationOfBurn=5;
		switch(I.material()&RawMaterial.MATERIAL_MASK)
		{
		case RawMaterial.MATERIAL_LEATHER:
			durationOfBurn=20+I.phyStats().weight();
			break;
		case RawMaterial.MATERIAL_CLOTH:
		case RawMaterial.MATERIAL_SYNTHETIC:
		case RawMaterial.MATERIAL_PAPER:
			durationOfBurn=5+I.phyStats().weight();
			break;
		case RawMaterial.MATERIAL_WOODEN:
			durationOfBurn=40+(I.phyStats().weight()*2);
			break;
		default:
			switch(I.material())
			{
			case RawMaterial.RESOURCE_COAL:
				durationOfBurn=20*(1+I.phyStats().weight()*3);
				break;
			case RawMaterial.RESOURCE_LAMPOIL:
				durationOfBurn=5+I.phyStats().weight();
				break;
			default:
				return;
			}
			break;
		}
		mob.location().showHappens(CMMsg.MSG_OK_VISUAL,_("@x1 ignites!",I.name()));
		final Ability B=CMClass.getAbility("Burning");
		if(B!=null)
			B.invoke(mob,I,true,durationOfBurn);
	}