Table 1.

The set of mixtures designed by response surface model.

Number	Essential oil of thyme, %	Colloidal silica, %	Paraffin oil, %	Olive oil, % (till 100%)
(1)	0,1	4.28	30	65.62
(2)	0,1	5.00	10	84.90
(3)	0,1	5.00	50	44.90
(4)	0,1	6.75	1.72	91.43
(5)	0,1	6.75	58.28	34.87
(6)	0,1	6.75	30	63.15
(7)	0,1	6.75	30	63.15
(8)	0,1	6.75	30	63.15
(9)	0,1	6.75	30	63.15
(10)	0,1	6.75	30	63.15
(11)	0,1	8.5	10	81.40
(12)	0,1	8.5	50	41.40
(13)	0,1	9.22	30	60.68