Allow dripsone to drip purple when attached to crying obsidian

I am making a Halloween build. I have crying obsidian on the top dripping into another block (also crying obsidian) with spruce trap doors around it so it looks like a potion. I was hoping by adding dripstone to the top crying obsidian it would drip purple but it drips water. It would be really cool if it would drip the purple drops like it does with lava.

Even cooler is if you could add the same effect as the lava to the cauldron so we could have a purple potion brewing in the cauldron.