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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 8, Number 4
August 20, 1964 

Studies on the Light Fastness of Dyeings. (Ⅱ) Fading Rate Curve

염색물의 일광에 대한 견의성에 관한 연구 (제2보) 퇴색속도 곡선에 대하여
Wan Shik Ha

The author proposed an equation of fading rate, expressed as ΔE = ΔE1∞(1-e-k1t) + k2t, where ΔE = fading of dye (colour difference of N.B.S. unit), ΔE1∞ = extremity value of fading of molecularly dispersed dye, k1, k2 = constants, t = exposure (hours). The validity of above equation, which is connected with the state of dye in fibre, was confirmed by experimental in a range of 2-3 colour fading in grey scale value for assessing change in colour visually, except the case of increasing the fading rate with the time resulted from the break-down of dye particles through the heat effect of light; it was also discussed about possiblity of evaluating of fastness to light of dye in early stage.
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