a red pigment produced by marine bacterium strain S-9801 has better biological properties. The extracting methods, physi-chemistry and toxicity of the pigment were studied. The test shows that the pigment can be dissolved in all the 5 impregnants. Ethanol is optimum choose for extraction. Physi-chamical characteristics of this pigment was stable. The absorbance of the pigment solution has no losing when put this under natural illumination for 10 d or treated with UV for 30 min, color of the pigment has not ...