Straight from the 1841 Ordnance manual. Not lacquer, but very probably polymerized oil.
114
CHAP. VI. -SMALL ARMS.
BROWNED ARMS.
The barrels and mountings of rifles and carbines are browned at the armories before being received for the service; the locks, ramrods, band springs, bayonets for 6 in. from the points, triggers, receivers and screws are not browned. The parts of these arms should be thoroughly inspected before browning, and the finished arm after being browned.
Instructions for Browning Arms.
Materials for Browning Mixture.
1 1/2 oz. spirits of wine.
1 1/12 oz ' tincture of steel.
1/2 oz. corrosive sublimate.
1 1/2 oz. sweet spirits of nitre.
1 oz. blue vitriol.
3/4 oz. nitric acid.
To be mixed and dissolved in 1 quart of soft water - the mixture to be kept in glass bottles and not in earthen jugs.
Previous to commencing the operation of browning, it is necessary that the barrel or other part should be made quite bright with emery or a fine smooth file, (but not burnished,) after which it must be carefully cleaned from all greasiness; a small quantity of pounded lime rubbed well over every part of the barrel is the best - for this purpose. Plugs of wood are then to be put into the muzzle of the barrel and into the vent, and the mixture applied to every part with a clean sponge or rag. The barrel is then to be exposed to the air for twenty -four hours; after which time, it is to be well rubbed over with a steel scratch card or scratch brush, until the rust is entirely removed; the mixture may then be applied again, as before, and in a few hours the barrel will be sufficiently corroded for the operation of scratch brushing to be repeated. The same process of scratching off the rust and applying the mixture is to be repeated twice or three times a day for four or five days, by which time the barrel will be of a very dark brown color.
When the barrel is sufficiently brown and the rust has been carefully removed from every part, about a quart of boiling water should be poured over every part of the barrel, in order that the action of the acid mixture upon the barrel may be destroyed and the rust thereby prevented from rising again.
The barrel, when cold, should afterwards be rubbed over with linseed oil or sperm oil. It is particularly directed that the steel scratch card or scratch brush be used in the place of a hard hair brush, otherwise the browning will not be durable nor have a good appearance.
The browning mixture is applied to other parts of arms in the same manner as to the barrels.