One year I was frustrated that a lot of the notes we put on the beehives in
marker were fading in the sun and becoming illegible.  I decided to try "tag
markers" available at the vet clinic for putting numbers on blank hog and
cattle ear tags.  Those markers do leave a mark you can read for years.  But
the bees would start to attack the marker (and the hand holding it), the
moment the cap came off.  The solvent in those markers is xylene.

Have gone back to cheap markers and coloured tacks.

Stan

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