Wikipedia
Silver stain
Silver staining is the use of silver to selectively alter the appearance of a target in microscopy of histological sections; in temperature gradient gel electrophoresis; and in polyacrylamide gels.
Usage examples of "silver stain".
He came across him sitting in what had been his garden, with eyes as vacant as his soul, staring south, waiting for the first glimmer of light to make a silver stain on the far faint curve which was the rim of the world.
Rani tugged at the sleeves of her gown, forcing her attention back to the formula for silver stain.
And presently, definitely, magically, a thin silver stain began to form in the tube where the flame impinged upon it.
Greg saw a circular silver stain emerge at the centre and split into six arms, spreading out to the rim.