5. We need say but little of a practice which St. Jerome(23) and others speak of as prevalent towards the end of the fourth century, that of dyeing the vellum purple, and of stamping rather than writing the letters in silver and gold. The Cotton fragment of the Gospels, mentioned above (p. 23), is one of the few remaining copies of this kind, as are the newly discovered Codex Rossanensis and the Codex Beratinus, and it is not unlikely that the great Dublin palimpsest of St. Matthew owes its present wretched discoloration to some such dye. But, as Davidson sensibly observes, “the value of a manuscript does not depend on such things” (Biblical Criticism, vol. ii. p. 264). We care for them only as they serve to indicate the reverence paid to the Scriptures by men of old. The style, however, of the pictures, illustrations, arabesques and initial ornaments that prevail in later copies from the eighth century downwards, whose colours and gilding are sometimes as fresh and bright as if laid on but yesterday(24), will not only interest the student by tending to throw light on mediaeval art and habits and modes of thought, but will often fix the date of the books which contain them with a precision otherwise quite beyond our reach. 6. The ink found upon ancient manuscripts is of various colours(25). Black ink, the ordinary writing fluid of centuries (μέλαν, _atramentum_, &c.) differs in tint at various periods and in different countries. In early MSS. it is either pure black or slightly brown; in the Middle Ages it varies a good deal according to age and locality. In Italy and Southern Europe it is generally blacker than in the North, in France and Flanders it is generally darker than in England; a Spanish MS. of the fourteenth or fifteenth century may usually be recognized by the peculiar blackness of the ink. Deterioration is observable in the course of time. The ink of the fifteenth century particularly is often of a faded grey colour. Inks of green, yellow, and other colours, are also found, but generally only for ornamental purposes. Red, either in the form of a pigment or fluid ink, is of very ancient and common use, being seen even in early Egyptian papyri. Gold was also used as a writing fluid at a very early period. Purple-stained vellum MSS. were usually written upon in gold or silver letters, and ordinary white vellum MSS. were also written in gold, particularly in the ninth and tenth centuries, in the reigns of the Carlovingian kings. Gold writing _as a practice_ died out in the thirteenth century: and writing in silver appears to have ceased contemporaneously with the disuse of stained vellum. The ancients used the liquid of cuttle-fish. Pliny mentions soot and gum as the ingredients of writing-ink. Other later authors add gall-apples: metallic infusions at an early period, and vitriol in the Middle Ages were also employed.