Part 3 (1/2)

PAINTING ON ZINC OR ON GALVANIZED IRON

Painting on zinc or galvanized iron is facilitated by e a mordant of 1 quart of chloride of copper, 1 of nitrate of copper, and 1 of sal-ammoniac, dissolved in 64 parts of water To thin mixture add 1 part of commercial hydrochloric acid This is brushed over the zinc, and dries a dull-grey colour in fro perfectly to the surface thus for are the forned to impart to polished brass various colours The brass objects are put into boiling solutions composed of different salts, and the intensity of the shade obtained is dependent upon duration of the immersion

With a solution corains; hydrochlorate of areenish shades are obtained With the following solution, all the shades of brown, froe-brown to cinnarains; sulphate of copper, 150 grains; and water, 1 quart The following solution gives the brass first a rosy tint, and then colours it violet and blue: sulphate of copper, 435 grains; hyposulphite of soda, 300 grains; crea to this solution arains, and hyposulphite of soda, 300 grains, there are obtained, according to the duration of the ie, rosy, and then bluish shades Upon polarizing the ebullition, the blue tint gives way to yellow, and finally to a pretty grey

Silver, under the same circu ebullition in the following solution, we obtain a yellon shade, and then a rerains; carbonate of nickel, 30 grains; salt of nickel, 75 grains; and water, 10 oz The following solution gives a beautiful dark-brown colour: chlorate of potash, 75 grains; salt of nickel, 150 grains; and water, 10 oz The following gives in the first place, a red, which passes to blue, then to pale lilac, and finally to white: orpirains; and water, 10 oz The following gives a yellon: salt of nickel, 75 grains; sulphate of copper, 75 grains; chlorate of potash, 75 grains; and water, 10 oz Onsolutions, sulphur separates, and the brass becomes covered with iridescent crystallizations: (1) crearains; and water, 10 oz (2) Hyposulphite of soda, 225 grains; and water, 5 oz Upon leaving the brass objects i th acquire a very beautiful blue colour: hepar of sulphur, 75 grains; arains; and water, 4 oz

A GOLDEN VARNISH FOR METAL

Take 2 oz of guold, and 4 oz of clarified linseed oil, which boil in a glazed earthenware vessel till the contents appear of a transparent yellow colour This willfor enaoods

CARRIAGE VARNISH

The following is used for the wheels, springs, and carriage parts of coaches and other vehicles: Take of pale African copal 8 lb; fuse, and add 2-1/2 gallons of clarified linseed oil; boil until very stringy, then add 1/4 lb each of dry copperas and litharge; boil, and thin with 5-1/2 gallons of turpentine; thenvarnish, and immediately strain the mixture into a covered vessel Guallons; 1/4 lb each of dried sugar of lead and litharge; boil, and thin with 5-1/2 gallons of turpentine; and mix it while hot as above directed

Of course these quantities will only do for big jobs, and as it has to do with ht advisable to include the formula in this handbook

METAL POLISHES

The active constituent of all e, or tripoli, because these produce a polish on ood polishi+ng soaps:--

(1) 20 to 25 lb liquid soap is intimately mixed with about 80 lb of Swedish chalk and 1/2 lb Pompeiian red (2) 25 lb liquid coco-nut oil soap is mixed with 2 lb tripoli, and 1 lb each alum, tartaric acid, and white lead (3) 25 lb liquid coco-nut oil soap is e and 1 lb ammonium carbonate (4) 24 lb coco-nut oil are saponified with 12 lb soda lye of 38 to 40 B, after which 3 lb rouge, 3 lb water, and 32 gra pomades are as follows: (1) 5 lb lard and yellow vaseline is e (2) 2 lb

palether, and then 1 lb rouge, 400 grains tripoli, and 20 grains oxalic acid are stirred in (3) 4 lb fatty petroleue The polishi+ng poenerally perfu powders are prepared as follows: (1) 4 lb

e are intinesiue An excellent and harether 250 grains floated chalk, 1 lb alcohol, and 20 grains ammonia Gilded articles are rains borax in 100 parts water, by e or soft brush The articles are then washed in pure water, and dried with a soft linen rag Silverware is cleansed by rubbing with a solution of sodium hyposulphite

BLACK PAINTS

Carbon, in one forments By far the raphite Other black pig carbon black) and bone-black, the for in price from twopence to half a crown per pound Bone-black, which is refuse froe of carbon contained, which is usually about 10 or 12 per cent, the reinally present in the bone, and containing 3 or 4 per cent of carbonate, whilst most of the remainder is phosphate of lime La a sreatly retards the drying of the oil hich it may be mixed For this reason it is not used by itself, but is added in s their colour, and probably their durability For example, it is a common practice to add it to red lead, in order to tone down its brilliant colour, and also to correct the tendency it has to turn white, due to the conversion of the red oxide of lead into the carbonate

BLACK STAIN FOR IRON

For colouring iron and steel a dead black of superior appearance and perood formula: 1 part bismuth chloride, 2 parts mercury bi-chloride, 1 part copper chloride, 6 parts hydrochloric acid, 5 parts alcohol, and 50 parts la all well mixed To use this preparation successfully--the article to be blacked or bronzed being first rease--it is applied with a swab or brush, or, better still, the object may be dipped into it; the liquid is allowed to dry on thewater, the te maintained for half an hour If, after this, the colour is not so dark as is desired, the operation has simply to be repeated, and the result will be found satisfactory After obtaining the desired degree of colour, the latter is fixed, as well asfor a fewthe surface with oil, and heating the object till the oil is completely driven off The intense black obtained by thisfor ironwork, which is really a lacquer, is obtained byozokerite, which beco-point at 140 F The -point of water The objects to be lacquered are scoured clean by rubbing with dry sand, and are dipped in the melted nited by the objects being held over a fire After the ozokerite has burned away, the fla black coating, which resists atmospheric influences, as well as acids and alkalies If the black iron vessels are to contain alkaline liquids, the above operation is repeated

A good cheap stock black paint or varnish for ironwork is prepared, as follows: Clear (solid) wood tar, 10 lb; lamp black or mineral black, 1-1/4 lb; oil of turpentine, 5-1/2 quarts The tar is first heated in a large iron pot to boiling-point, or nearly so, and the heat is continued for about 4 hours The pot is then removed from the fire out of doors, and while still warm, and not hot, the turpentine, mixed with the black, is stirred in If the varnish is too thick to dry quickly, add more turpentine Benzine can be used instead of turpentine, but the results are not so good Asphaltuood black varnish for ironwork, take 8 lb of asphaltuallons of boiled linseed oil, 1 lb of litharge, 1/2 lb of sulphate of zinc (add these slowly, or the mixture will boil over), and boil theuer, or until the mass will become quite thick when cool After this it should be thinned with turpentine to the proper consistency

VARNISHES FOR IRONWORK

A reliable authority gives the following as a very good recipe for ironwork varnish Take 2 lb of tar oil, 1/2 lb of pounded resin, and 1/2 lb of asphaltuether, and thenall care to prevent the fla into contact with the mixture When cold the varnish is ready for application to outdoor ironwork Another recipe is to take 3 lb of powdered resin, place it in a tin or iron vessel, and add thereto 2-1/2 pints of spirits of turpentine, which well shake, and then let it stand for a day or two, giving it an occasional shake Then add to it 5 quarts of boiled oil, shake it thoroughly well all together, afterwards letting it stand in a warets clear The clear portion can then be drawn off and used, or reduced with spirits of turpentine till of the requisite consistency Fora varnish suitable for iron patterns, take sufficient oil of turpentine for the purpose of the job in hand, and drop into it, drop by drop, so commercial oil of vitriol, when the acid will cause a dark syrupy precipitate in the oil of turpentine, and continue to add the drops of vitriol till the precipitate ceases to act, after which pour off the liquid and wash the syrupy mass ater, when it will be ready for use When the iron pattern is to be varnished, it ree, the syrupy product applied, and then the article allowed to dry