Is there a quest I need to complete to get these two colors? I am trying to get an achievement for having all the colors. Thank you for any help you can offer

No, they come from potions. +

Thank you, guess no one has them as I have searched and can't find one

the Dark Matter Potion is always available in the Millionaire Center. The Potion of Purity may be there now or it may be seasonal there.

, where do I find the Millionaire Club? What is the Potion of Purity?

The shop search for Dark Matter Potion actually links you right to the Millionaire Center (but it's a big square building in Centropolis). is another MC item, it's what you need for a Scribble pet and it appears to be seasonal in the MC as it's not in there.

why did you consider 's answer adequate, and how in the hell did you determine that there wasn't any in shops if you didn't? checks yep, there's Dark Matter Potions for sale in user shops. Are you a human being or an AI?

Hover over the images of the answer she gave you if you want to know their names. If you want to know where things are, look in the Subeta Wikia fansite. Then, go to the Frequently Asked Questions & Threads in this very forum.

, I found the Dark Matter Potion. The reason I couldn't find it was because I made it all one word. Now I know why I can't find the Scribble Potion