Rose leaves, Salt, Olive oil.
Pick enough rose leaves to make a quart when closely pressed down. Put a layer of these in a 2-quart glass fruit-jar, and sprinkle lightly with salt, then cover with a thin layer of absorbent cotton wet with olive oil.
Fill the jar with alternate layers in the same manner, and put on the rubber cover and set the jar in the sun daily for 2 weeks or longer, if the weather be cloudy.
Uncover, and press the oil from the leaves and cotton, and place it in very closely corked vials.