What Causes Vertical Black Lines On Nails? December 09, 2021 We have a look at what the black lines on nails mean, and how to treat them. Tags: nail dip powder kit in the UK Share on Facebook Tweet Pin it Previous Post Categories dip powder dip powder nails dipping powder nail dip powder kit in the UK Nexgen dipping powders Nexgen nail extensions professional nail tools UK nail dipping powder white nexgen nails