I don't have the packaging anymore for ours so can't say what ours are made of but can say that they have stained the bath in places - it tends to be when DD has done a circle or big line - it fades but you can still see a faint line which then continues to fade over time. We have tried using a number of things to get it off.
OUr bath is a very old (installed in the 1940s) and is a blue bath - not sure how they would go on a white bath or if the staining is because of the age of the bath. We don't mind about the staining and as I said it has faded over time (some of the earlier ones we can't see anymore)
DDs favourite thing at the moment is to draw on herself with them - sometimes they slightly stain her skin so she comes out of the bath not as clean as she went in LOL but she has fun and that is the main thing


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). Luckily our bathroom is 1) old, and 2 ) painted in an orange/yellow scheme, so a few orange/red stains between the tiles don't stand out, but if you have a very modern, clean, sparkling bathroom it could be an issue...



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