Few things..
It's naphtha, not nampha.
The very first google link for lye will tell you the full name, you could have done that too

Please check our FAQ for answers to some of those and more questions
As for what Igel said, raise pH to more than 10, raise to 13+ (if you are measuring pH). If not, just freely add lye (slowly) and stir.
Why do you need an A4 paper?
Lastly, 100grams psychotria viridis isnt much at all, unless its some really potent stuff, you probably wont get much out. I hear hawaian chacruna is the more potent but dont know how reliable that information is, might be some is potent and some is not depending on where in hawai, specific genetics, how it was grown, etc.