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We think the temperature fluctuations between Australia to the U.S. and then to Bermuda are the issue. We just found it problematic to have to change out tubes when a whole shipment of a certain colour would separate in the tube. It's a HUGE shame as these work MARVELOUSLY! If you have a tube do this, you can squirt the whole tube into an airtight container and mix it back together again. It still works and it can be re-mixed, there's just certain colours that have the medium separate from the pigment.\u003c\/p\u003e\n\u003cp\u003ePlease also note the purple swatches are correct. Their purples are VERY dark and generally will need some mixing white added to brighten them up. We generally suggest mixing your own purple with blue and red.\u003c\/p\u003e"}