Another thing to keep in mind when analyzing the authenticity of the modern day chilazon is how literally one should understand the various mamrei chazal that deal with techeles. For instance, the statement that the chilzaon only surfaces once in every seventy years and that it is very expensive as a result. Many positions hold (especially those in favor of the practice of wearing techeles) that it is unlikely that the animal only surfaces exactly once in 70 years, rather it means something that is rather scarce.
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