Is there any difference in the longevity of the color if you process with additional passes of the flat iron?

No. Processing additional passes with the flat iron may result in a slightly different tonal result (more lift with framesi FRAMCOLOR 2001 LIGHT&SHINE) but there will be no difference in the longevity

No. Processing additional passes with the flat iron may result in a slightly different tonal result
(more lift with framesi FRAMCOLOR 2001 LIGHT&SHINE) but there will be no difference in the
longevity. Longevity after 5 passes or 10 passes will be at least equal to or even greater in some
cases than the longevity experienced with traditional processing times.