Please comment on the use of purple in Emily Dickinson's poem "One Dignity Delays for All."What does purple symbolize (mean) in this poem?

Purple is the color of royalty. In ancient times, the cost
of making purple dye was so great that only royalty could afford to buy it. It is said
that in order to make just one ounce of purple dye took 20,000 purpura snails, from
which the dye was obtained. Purple is also traditionally the color of death, perhaps
because it is so dark. Liturgical churches, like the Roman Catholic Church, use the
color purple in vestments and hangings for Easter, in anticipation of the
Crucifixion.

In her poem, Dickinson uses both meanings of
purple. By "mitred Afternoon," she is referring to the fact that most funerals take
place in a church (the mitre is a hat worn by a bishop). As she describes the trappings
of a funeral: a coach (hearse), footmen (pall bearers), chamber (coffin), bells,
attendants, she likens a funeral to a royal procession. In death, all persons are equal,
both the highborn and the commoner.