As variety of fires adds greatly to a collection of works, it is necessary that every artist should know the different effect of each ingredient; for which reason, I shall here explain the colours they produce of themselves; and likewise how to make them retain the same when mixed with other bodies: as for example, sulphur gives a blue, camphor a white or pale colour, saltpetre a clear white, yellow amber a colour inclining to yellow, sal-armoniac a green, antimony a reddish, rosin a copper colour, and greek-pitch a kind of bronze or between red and yellow. All these ingredients are such as shew themselves in a flame, viz. For a white Flame. Saltpetre, sulphur, meal powder, and camphor, the saltpetre must be the chief part. For a blue Flame. Meal powder, saltpetre, and sulphur vivum, the sulphur must be the chief part: or, meal powder, saltpetre, brimstone, spirit of wine, and oil of spike; but let the powder be the principal part. For a Flame inclining to Red. Saltpetre, sulphur, antimony, and greek-pitch, the saltpetre the chief part. By the above method may be made various colours of fire, as the practitioner pleases; for, by making a few trials, he may cause any ingredient to be predominant in colour. Of such Ingredients as shew themselves in Sparks when rammed in choaked Cases. The set colours of fire produced by sparks are divided into four sorts, viz. the black, white, grey, and red; the black charges are composed of two ingredients, which are meal powder and charcoal; the white of three, viz. saltpetre, sulphur, and charcoal; the grey of four, viz. meal powder, saltpetre, brimstone, and charcoal; and the red of three, viz. meal powder, charcoal, and saw dust. There are, besides these four regular or set charges, two others, which are distinguished by the names of compound and brilliant charges; the compound charge being made of many ingredients, such as meal powder, saltpetre, brimstone, charcoal, saw dust, seacoal, antimony, glass dust, brass dust, steel filings, cast iron, tanner’s dust, &c. or any thing that will yield sparks; all which must be managed with discretion. The brilliant fires are composed of meal powder, saltpetre, brimstone, and steel dust; or with meal powder and steel filings only. How to make Cotton Quick-match.