Invisible UV Pen 1,Conform ASTMD-4236,EN71,6P,Lead 2,OEM client' logo 3,Ink can be seen ... only under uv/black ligh Permanent Invisible UV PenWe are professional ... standards.Material PP Pen tip bullet fiber tip Ink colors Invisible color Logo one color & full colors logo ... ?Paint on clothes,furniture,leature and so on.Ink visible only under uv/black light. Other Similar ...