Jaiminīya (Talavakāra) Brāhmaṇa 1.80.p7

1.80.p7

atha yaṃ kāmayeta śreyānsyādrucamaśnuvīteti phālgunamasya pavitraṃ

Then, if he should desire of someone, 'May he become better, may he attain brilliance,' he should make his filter of reddish-white [wool];