Table 2.

L*, a*, b* as CIELab color coordinates obtained by FORS analyses on the “Unaged” and open- and closed-cell PF foams. Their shift and the total color change (∆E*) are also reported.

Structure Cell Type	Samples		Color	CIELab Color Coordinates			CIELab Color Shifts			Total Color Change
				L*	a*	b*	∆L*	∆a*	∆b*	∆E*1976
Open-cell	Gardol	“Unaged”		52.4	−8.0	12.3	1.1	5.6	1.9	6.0
		Natually Aged		53.5	−2.4	14.2
	Oasis	“Unaged”		59.2	−25.5	3.0	−2.3	3.3	1.7	4.4
		Natually Aged		56.9	−22.2	4.7
Closed-cell	Balsa Foam Soft Density	“Unaged”		82.4	20.6	49.8	2.1	−1.6	1.1	2.9
		Naturally Aged 1		84.5	19.0	50.9
		Naturally Aged 2		73.6	26.3	49.3	−10.9	7.3	−1.6	13.2
	Balsa Foam 5 PCF	“Unaged”		86.8	17.3	51.1	−0.6	−1.9	−2.1	2.9
		Naturally Aged 1		86.2	15.4	49.0
		Naturally Aged 2		80.3	21.2	50.1	−5.9	5.8	1.1	8.3
		Naturally Aged 3		70.5	26.4	45.9	−9.8	5.2	−4.2	11.9
	Austrotherm	“Unaged”		59.1	23.2	25.0	7.1	7.4	14.8	18.0
		Naturally Aged 1		66.2	30.6	39.8
		Naturally Aged 2		72.1	28.5	47.1	5.9	-2.1	7.3	9.6