I have no idea why it works, but it does. The box that I get is dark blue? Sorry that's all I can tell you and it only costs around $3.00 (Australian)...
If there are more expensive brands, i would hazzed at a guess that it's just marketing, bigger Companies... If you read what it consists of on the "blue" box say, and a more expensive one, I am pretty sure that they will tell a simular story...
CW



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