Sorry, I couldn't find the post from the other day when someone asked about pink and purple fading. I have an answer for anyone who needs this. When using purple add milk and a little pink or rose paste color. The pink helps hold the purple. For pink use Rose instead of pink paste color, it is more vibrant, but holds color. A small amount of rose will get you a nice pink color.
I hope this helps.
I wasn't me but thanks for the great tip.