Answer:
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I am easy to waste. I am unstoppable. What am I?
I am black when you buy me red when you use me when I turn white you know itβs time to throw me away.
I am a tool for fairies.
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?