What should I use to darken my eyelashes?

[mmmmaax]

I have relatively long eyelashes that touch my eyebrows easily, however on my lower lashes they are blonde on the ends which makes them look shorter than they are, just curious what would be the best option and preferably something that's not a dye if there is such a thing

 

[BrJedam]

eyebrow tint though temporary

 

[guapanese]

Any black hair dye it’s gonna burn but oh well