I've used tangerine essential oil and micas for the colours. I was afraid I have gone too far with the amount of micas : apparently they might turn the bath tub in a mess ! I've eventually used them and I have to admit that it's true that micas leave a halo on the sink edge, but it gets away with a bit of clean tap water!!! They smell incredibly good, the bubbling is adorable and colours are amazing.
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