ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 19, Number 1
JKCSEZ 19(1)
February 20, 1975 

Sulfur-dyes were manufactured from humic acid, Na2S2∼3 and other additives at 200∼250℃ for 3∼20 hrs. Sulfur-dyes from humic acid were fundamentally brown colors and could be changed from yellowish to grayish brown according to the additives. The colorfastness to rubbing and laundering were excellent but to weather was fair. Characteristic bonds of sulfur-dyes such as -C-S-C, -C-SO-C-. -C-SO2-C-, and -C-O-SO2-O-C- were confirmed but thiazole bond and thiazine ring were not done by IR-spectroscopy.