The pure sky, and the waters so placid—
And these tenderer tints to defend from attack,
With some turpentine varnish and sooty lamp-black
You must stop out the ferreting acid.
But before with the varnishing brush you proceed,
Let the plate with cold water be thoroughly freed
From the other less innocent liquor—
After which, on whatever you want to protect,
Put a coat that will act to that very effect,
Like the black one which hangs on the Vicar.