We got the chance to play around with Marvin's Amazing Magic Pens, which change color when you use the magic pen against them!
Marvin's Magic - x 25 Amazing Magic Pens, Colouring
Marvin's Magic 30 Amazing Magic Changing Pens
Marvin's Magic 30 Amazing Magic Changing Pens
Marvin's Amazing Magic Pens (2 x 25 Pack) – Marvin's Magic Worldwide
Marvin's Magic - Original x 20 Amazing Magic Pens - Color Changing
Marvin's Amazing Magic Pens - 20 pcs - Marvin's Magic
Marvin's Magic 30 Amazing Magic Changing Pens
Coloring with Marvin's Amazing Magic Pens ⋆ Jupiter & Dann
Marvin's Magic - NEW x 30 Amazing Magic Pens
Marvin's Magic Rainbow Colouring Fun – Marvin's Magic Worldwide
Marvin's Magic Rainbow Colouring Fun – Marvin's Magic Worldwide
Marvin's Magic - Original x 25 Amazing Magic Pens
Marvin's 25 Amazing Magic Changing Pens