It was observed that employing higher operating current, such
as 60 μA, would result in higher rate in producing the titrant and
due to limitation in slower rate of mixing of the titrant with
sample via convection
change of the indicator for a blank solution. The time for color
change would take longer for the smaller operating current; the
timing for the color change of indicator for the blank solution is
taken into account for the blank value (or blank timing) in the
analysis procedure.