Show natural color of pue water it was long ago discoverer disco verel that the natural color of pure water Is blue and not white as most of us usually supposed opinions have not agreed on the cause of the green and yellow tints these it has been discovered by W spring are due to extraneous substances dissolved calcium salts though apparently giving a green tint due to a fine invisible suspension have no effect on the color of the water when adequate precautions are taken the brown or yellow color due to iron salts is not seen when cal caum Is present the gre n tint is often due to a condition of equilibrium between the color effect of the iron salts and the precipitating action of the balcum salts scientific ameri can |