Table 2.

Yield and moisture content of silica.

Silica	Ash: NaOH ratio (w/v) for extraction condition	Yield (%)	Moisture absorption (%)	Color
No. 1	1:5	61.2	56.7	Yellowish
No. 2	1:8	80.5	73.4	Light gray
No. 3	1:10	63.9	75.6	Light gray