Virtual reconstruction of the painting process and original colors of a color-changed Northern Wei Dynasty mural in Cave 254 of the Mogao Grottoes

Heritage Science

Table 2 Color description of mural pigments in the multi-band images

Test No	VISR < 400–700 nm <	H	S	B	IRRFC < 830 nm	H	S	B	UVRFC < 365–400 nm <	H	S	B	UVL Excitation: 365 Emission: 400–700 nm	H	S	B
1	Blue	218	23	43	Pink	346	17	48	Olive green	102	26	45	–	240	62	3
2	Bean green	185	16	60	Blue	213	26	53	Tea green	62	43	62	–	225	44	4
3	Ivory white	60	10	75	Milky white	51	7	77	Off white	42	35	74	Deep iron blue	192	29	14
4	White	41	10	72	Milky white	49	6	77	Off white	38	27	72	Deep iron blue	150	16	15
5	Light red	18	47	64	Pale lemon yellow	48	42	72	Dark brown	300	16	31	Salmon	16	48	66
6	Charcoal gray	36	6	35	Emerald black	168	54	36	Charcoal gray	266	13	43	Blue green	123	17	42
7	Black brown	11	33	26	Olive brown	47	40	42	Blue black	227	47	42	–	225	44	4
8	Maroon	16	46	44	Jade green	87	35	42	Charcoal gray	195	4	44	Salmon	23	58	57
9	Deep red	355	71	25	orange brown	38	63	36	Olive black	246	56	20	Salmon	20	55	42
10	Red brown	12	51	39	Black yellow green	59	52	50	Clay	16	24	31	–	0	14	3

This table denotes the false colors in the UVRFC and IRRFC images representing the current VISR colors of the mural. The HSB (H: hue, S: saturation B: brightness) values of each color are also indicated. The descriptions of the colors in the various images represent non-objective terms. The HSB color model can be used to describe and display the corresponding color objectively