Translation of Linear B textiles tablet, KN 474 R q 21:

KN 474 R q 21 textiles

This tablet does not present any unexpected problems. The only issue is that we do not know what kind of cloth the supersyllabogram PU refers to. It is called pukateriya in Mycenaean Greek, but since the word is archaic, having fallen out of use with the collapse of the Mycenaean Empire ca. 1200 BCE, there is no way we can recover its precise meaning, i.e. to establish exactly what kind of cloth it refers to.  But we do know that the cloth is popureya = purple.