I just brewed one and got a skill improvement from 102 to 103. Glad to find out what the plains roots were for :). Just took a look at eqtraders, which states that this is used in human cultural tailoring to make robes, and that the trivial is 127.
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EQ: Runyaessz, 5 Monk, Phinigel EVE: Runym/Runyn/Runyl, 43M SP each SWTOR: Pardoric, 22 Merc, on vaca EQ: Runyariel Varyuvantel, 65 Enchanter, Tarew Marr, on vaca LoTRO: Runyarian, 38 hunter, Vilya, on vaca WoW: Runyarian, 70 hunter, Muradin, on sabbatical EQ2: Runylala, 25 Troll Bard, Qey, Blackburrow, retired WAR: Runyael, 30 DiscO Khaine, Ironfist,retired. CoH: Hissing Chicken, 16 Scrapper, Pinnacle, retired
I just tried to brew some plains dye twice and failed both times. On the second fail, my brewing skill went from 46 to a 47, so i dont think it is trivial at 21, but i just started brewing the other day, iand i dont know much about it.