Paragraph 6

England, Wales and Scotland

Black Diamond Gem briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—

(a)

comprise anthracite duff (as to 20 to 30% of the total weight), petroleum coke (as to 40 to 45% of the total weight), bituminous coal (as to 12 to 22% of the total weight) and molasses and phosphoric acid binder (as to the remaining weight);

(b)

were manufactured from those constituents by a process involving roll-pressing and heat treatment at approximately 300°C;

(c)

are pillow-shaped briquettes marked with two parallel indented lines running latitudinally around the briquette;

(d)

have an average weight of 160 grams per briquette; and

(e)

have a sulphur content not exceeding 1.5% of the total weight.