This paper investigated the compatibility of disperse dyes and Lanasol reactive dyes at one-bath dyeing condition for PLA/wool blends,analysed the effects of different dyeing process parameters on union dyeing in one-bath and established the suitable dyeing process parameters for PLA/wool blends.

According to the problem of union dyeing of wool/silk blends with one bath and one step dyeing,the low temperature dyeing with redox system was used in the one bath and one step dyeing of wool/silk blends.

Factors exerting influence on identical color ability of blended fabrics are analyzed,such as salts,alkali,fixing temperature.

This paper studies the identical color ability and tensile properties of the silk-flax blended knitting fabric,and chose proper technological parameters like temperature,time,amount of soda,neutral salt to optimize the dyeing process.

An investigation on the application of redox system on the union dyeing of wool/silk blends;

Cationic modification of ramie before spinning of wool/ramie blending yarn was applied in improving the union dyeing of the blends.

For wool,the dye uptake and the colour yield (K/S) reached or exceeded that dyed at boiling with the selected acid dyes and reactive dyes;for union dyeing of wool/silk blends,the system resulted in improved union colour without jeopardizing the dye fastness.

Evaluation of color metamerism and color rendering property;

The principle,phenomenon and required conditions of metamerism were discussed.

On the basis of the Young-Helmholtz theory, a method for assessing degree of metamerism of colored objects is developed by using the concept of average Hamming distance in terms of the differences of spectral visual response.

The existence of a concolorous rectangle on m×n chessboard dyed by r-color is introduced.