Reicht, fetch me that!" Reicht brought a glass trough with a glass lid fitting tight.

"When your oil has been washed in bottle, put it into this trough with water, and put the trough in the sun all day.
You will soon see the water turbid again.

But mark, you must not carry this game too far, or the sun will turn your oil to varnish.

When it is as clear as crystal, not too luscious, drain carefully, and cork it up tight.

Grind your own prime colours, and lay them on with this oil, and they shall live.