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I used to use DC SuperShow Blue all the time, then I bought some tanzanite.
Then, damn it all, I fell deeply in love with Pelikan Royal Blue... which I can buy by the liter.
But back to the initial point, Private Reserve has a reputation for over-saturating their colors, which makes people consider diluting them with water to extend the life of the bottle. That might be just the thing to do if you LOVE a color and lack the resources to buy bottles too often.