You can get away with one colour and good records, so saving a whopping £3 or so for the pen. Once marked (and clipped) the queen should stay put and your records should tell you when you marked her. Good records are actually more important than marking queens (and I'm afraid this is a case of Don't do as I do, but do as I say ). I'm colourblind and really struggle with the red and green marking of queens.
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