Your kid would just do it themselves anyway.
Tween and Teen Crafts: No-Cook Playdough with Robin Willis and Scout Jensen
Play-Doh All Mixed Up Big Can of Crazy Pre-Mixed Assorted Modeling Compound Colors for Kids 2 Years and Up, Non-Toxic, 44 oz/2.75 Lb : Toys & Games
Play-Doh® Slime Compound Variety Pack Michaels, 58% OFF
Play Dough in the Preschool Classroom
1992 Playskool, Play-Doh Bug Oozer Set, Glow In The Dark, 60% OFF
Do I need to just accept that Play-Doh is one time use (with regard to colors remaining separate)? : r/daddit
How long till you were OK with this? : r/daddit
How to Make Play Dough –
You Can Get Your Kids A 3-Pound Container of Play-Doh That Comes With The Colors Smushed Together Kids Activities Blog