Black is wood burned. Purple is home made alcohol stain. Used some blue food coloring and the guts of two different purple "Sharpie" permanent markers. I use 10 drops of food coloring to one tablespoon of 91% or 71% rubbing alcohol. Mix coloring drops for other colors or add the Sharpie guts. Lots of ideas if you lookup alcohol ink on Pinterest.
PS- with the exception of 1)(red-white-blue) spiral, 2) Coral snake, and Maroon w/ gold spots: all the colored forks are with alcohol stain and blackish tips are wood burned. The cow and snake head are wood burned and soaked in linseed solution.