To Remove Rust From Steel.

Steel which has been rusted can be cleaned by brushing with a paste compound of 0.5 oz. cyanide potassium, 0.5 oz. castile soap, 1 oz. whiting, and water sufficient to form a paste. The steel should be washed with a solution of 0.5 oz. cyanide potassium in 2 oz. water.

To Preserve Steel From Rust.

1 part caoutchouc, 16 parts turpentine. Dissolve with a gentle heat, then add 8 parts boiled oil. Mix by bringing them to the heat of boiling water; apply to the steel with a brush, in the way of varnish. It may be removed with turpentine.

To Clean Brass.

1 part Roche alum and 16 parts water. Mix. The articles to be cleaned must be made warm, then rubbed with the above mixture, and finished with fine tripoli.

Blue Print Solution for Photographer.

1 pint citrate of iron ammonia, 2 pints red prussiate of potash, 1 pint gum arabic, 3 pints water.

Do.

1.25 oz. red prussiate of potash in 11 oz. water, 1 and 7/8 oz. citrate of ammonia in 5 oz. water. Mix together and keep in dark place. Corrections can be made with a pen dipped in a solution of

caustic soda. Also by bi-carbonate of soda. Also by a solution of lime.

Tinning Acid for Zinc or Brass.

Zinc, 3 oz.; muriatic acid, 1 pt. Dissolve, and add I pt. water and 1 oz. sal-ammoniac.