What would tinting my eyelashes do if they are already black

I'm considering to get them professionally done, since I have this free voucher, but anyway, will tinting them black make any difference if they already are black?What would tinting my eyelashes do if they are already black
The ends of them will be faded slightly from the sun so tinting will put the colour dark on the tips again and they look longer. I have black eyelashes but get them tinted for this reasonWhat would tinting my eyelashes do if they are already black
Well the only thing I noticed is you look better when you don't wear mascara but i always wear mascara so it doesn't matter.