Green liquid/saliva around sunflower seeds?

Last evening I was eating some sunflower seeds. I spit one of my final mouthfuls into a cup and left them on a table for 30 minutes. After this period my saliva and all liquid around spited seeds was green? Why is this happening?

Some says this is chlorophyll, other leeching minerals from seeds or bad pH in mouth? I'm worried because the last week i have eaten 2 kilos of them... pretty bad :(