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Lamotte Hardness Titration

I have a question concerning the Lamotte hardness titration kits
specifically the GH and Calcium kits. During the titration process the
sample turns from red to purple and finally to a blue color upon the
addition of the reagent.  At what point do you take the reading as a final
end point.  When it first turns blue or until it stays blue for a period of
time (how long)?  The GH test seems to turn back to a reddish purple after a
few seconds. If you continue to add more reagent it will turn blue again but
where are you supposed to take the reading?  The calcium titration seems to
stay blue after you add an extra drop or so after it first turns blue. TIA


Larry Lampert