HeshKalpi Tone 100 Gram (3.5 Ounce)

Does anyone know if the brahmi leaves that are used are bacopa monnieri or Centella asiatica, commonly known as centella and gotu kola?

what color tone will it add on grey/light bonde hair: ash or brown?

I mixed kalpi with coconut oil and left it for 2 hours (already tried 4 times), no help with grey at all, what I might be doing wrong?

can henna be used over it?