From nature’s own Pokeweed, but use caution

NOTE: Pokeweed is considered poisonous and toxic. Use gloves and do not eat. Keep out of the reach of children and pets. Use with caution.
From my nature walk last week, I picked some Pokeweed berries and used the juice to paint the Pokeweed I sketched in my nature journal.

If you want to try it yourself, just squish some berries and grab a brush. You can make a batch for later use, according to a recipe I found in the NY Times:
One cup of pokeweed berries, squished and strained into a bowl.
1/2 tsp. salt, 1/2 tsp. vinegar, stir.
Keep in a glass jar with a screw cap in a cool place.
Makes a beautiful paint or ink. Have fun!