pen & ink on mangostine dyed paper

I quite sponatenously dyed paper with mangostine skin yesterday ~ it turned out beautiful colour! I have no idea how lightfast it is, I did it just for fun with mangostine tea I had not drunk completly, I used just simple paper for printing, maybe next time I need to try on some pleasant handmade paper:-) I draw with just simple waterproof ink from art store, but I think I need to make some myself from what I have available here in nature..