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DIY: Non Toxic Litmus (Magic Ink) Painting

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I've been hunting for some non-toxic paints for my son (now 4 years old!) and the only brands that I have confidence in are the European and Japanese ones. The rest... sigh.. well, you know! I ended up getting a European set of poster paints from Popular for less than S$10.


Have been searching around for really non-toxic paints, and this is what I came across! Do you remember using litmus paper in your Chemistry or Biology classes in school? The stuff that changes colour when you add it to alkali or acid? Well, Leslie at Oko box blog has a recipe for making your own litmus paper from red cabbage and when you paint it with natural paints (ie. lemons, vinegar, baking soda). It's a bit like the magic ink/paper you see sold for ridiculous prices at the bookstores.
Can't wait to try this with the little one, and it's a great project for them too! You can eat the cabbage too! Only thing is I haven't seen any red cabbage being sold at NTUC Fairprice... anyone know where I can get it?

Photo from Oko box blog.
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