There are mines which have been discharging discolouring water, often for centuries, without causing serious damage.
The polluted mine water contaminates those sources, destroying wildlife and discolouring the water.
That would produce an effluent which to all intents and purposes would be completely innocuous and would not harm or discolour the river.
There were two babies with rickets clothed in cotton frocks, cotton vests and dilapidated napkins, no more than discoloured cotton rags.
The doctor informed me that the man's body became much more discoloured on the day following his admission.
They discolour and disfigure their eyes, and assure the charitable passer-by that they were born blind.
The water again became foul, offensive and discoloured, with sediment, bacteria and larvae in it.
Every spot of spray makes a lasting blot on the sails and discolours them for ever.
