Tit (Isis knot) amulet
Late Period–Ptolemaic Period
Some of the glass amulets from the later Late Period through the Ptolemaic Period can be specifically tied to spells of the Book of the Dead. For example, red is the preferred color for the tit knot: Book of the Dead chapter 156 prescribes a tit knot of red jasper at the throat of the deceased to provide him / her with the protection of Isis.
This tit knot is blocky and not completely worked out. Presumably it meant to be wrapped between the bandages of the mummy where the presence of the amulet would do its job irrespective of its degree of finish.
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