In method B, 50 μL of 1.5% suprapure nitric acid was put on the loosened fine powders of the ink, sucked and dispensed off at same place 3–4 times with the help of a micropipette..
In method B, 50 μL of 1.5% suprapure nitric acid was put onthe loosened fine powders of the ink, sucked and dispensed off atsame place 3–4 times with the help of a micropipette..