Effect of some additives on the ozone-bleaching of lignosulfonate was investigated. 1. Absorbancies of lignosulfonate at 280, 400 and 500 nm were diminished by the ozonation. The effect was the most prominent at 500 nm, but slightest at 280 nm. 2. Peracetic acid enriched the bleaching effect of ozone, showing the most remarkable effect at 500 nm. 3. Hyperchromicity of the lignosulfonate solution at 280 nm was observed by addition of hydrogen peroxide. On the other hand, this reagent remarkably promoted the ozone-bleaching at 400 nm. 4. Various absorptive change of the lignosulfonate solution was shown by the sorts of added salts. 5. As each absorptive wavelength of the lignosulfonate solution was net influenced similarly by these additives under the ozone introduction, it was suggested that selective increase or decrease in absorption at a certain wavelength could be possible.
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