• Each bottle holds 5ml of ink.
• Each ink comes in a dinky glass bottle with a handy pipette for easy application.

These highlighter inks can be neatly divided into two categories: Green and Purple are Dye-based, while Yellow, Blue, Pink and Orange contain pigments to give their vivid colour. 

Generally speaking, the pigment based highlighter inks are not compatible with other Tom's Studio pens and will cause the reservoirs or tips to become clogged – with the exception of calligraphy and dip pens.

That said, the Green and Purple highlighter ink can be used with the Lumos in any of the fibre or brush tips. But please note that they are not suitable for use with the Lumos fineliner or writing tips. If in doubt, do email the team and we'll be able to offer some guidance!