Vatthasutta 2.2

2.2

tamenaṃ rajako yasmiṃ yasmiṃ raṅgajāte upasaṃhareyya—yadi nīlakāya yadi pītakāya yadi lohitakāya yadi mañjiṭṭhakāya durattavaṇṇamevassa aparisuddhavaṇṇamevassa.

No matter what dye the dyer applied—whether blue or yellow or red or magenta—it would look poorly dyed and impure in color.