Table 2.

Design matrix and responses.

Runs	Coded value		Actual value		Responses
	Drying time (h)	Temp. (°C)	Drying time (h)	Temp. (°C)	Moisture content (%)	Color change (ΔE)
1	0	1	36	55	31.4	31.7
2	1	0	48	50	29.7	32.5
3	-1	-1	24	45	45.7	16.7
4	-1	0	24	50	44.7	19.8
5	1	1	48	55	26.4	36.1
6	0	-1	36	45	38.6	27.2
7	1	-1	48	45	31.2	30.3
8	-1	1	24	55	39.7	22.3
9	0	0	36	50	30.3	30.1