Answer:
I can be found after you remove 6 letters from BSAINXLEATNTEARS
I can be found in water but never wet
What goes up but never comes down?
What gets sharper the more you use it?
I am a way to say goodbye to your sweetheart
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.