Research: Moonglow Ink

In BfA, you gain this ability at (Classic) skill 25. Performing research will teach 4 glyphs from this recipe (also shown on "Teaches" tab):

1. 
   
2. Glyph of Foul Menagerie
3. 
   
4. [spell=148278]
5. 
   
6. Glyph of Stars
7. 
   
8. Glyph of the Spectral Wolf
9. 
   

Dreadras already did the math on herbs and pigment for approximate crafts to get all glyphs: link.

Research of this type turns yellow at skill 140.

At "vanilla" skill 75, you learn the next research type: Research: Midnight Ink, though you have to visit the trainer to learn Midnight Ink.
At "vanilla" skill 100, you learn the 3rd research type: Research: Lion's Ink, though you have to visit the trainer to learn Lion's Ink.

Just to clarify for anyone who may be confused by older comments, as of 10/10/2018 when I write this, with the current state of Inscription in Battle for Azeroth, there are indeed only 4 glyphs you learn through Research: Moonglow Ink as listed in the "Teaches" tab here:

Glyph of Foul Menagerie for Death Knight
Glyph of Inspired Hymns for Priest
Glyph of Stars for Druid
Glyph of the Spectral Wolf for Shaman

so that means in order to get all recipes

31x 3 moonglow ink= 93 moonglow inks which means 186 pigments in total

so if for every 5 herbs we get 2-4 pigments we are gonna need to farm 233-465 herbs depending how lucky you are :D