My first post in this section. I am possibly the least artistic person in the world, so please bear with me 
We have a stall at a local country fayre to raise funds for dd's pre school.
The stall will include personalised balloons were children can decorate/personalise their own balloons and then take them away. I've done some googling and it seems most websites refer to decorating with glue pens and glitter.
Does anyone know of any pens/markers that would work on foil balloons ?
Thanks