Chilazon Comparisons

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Are you getting confused between the different requirements and which ones are satisfied by the Sepia Officinalis, Murex Trunculus and Janthina?
This table compares the three most prominent candidates for the chilazon. Ideally, a grading system would be preferable to a yes/no response, but feel free to take the list of requirements and make your own grading based on your research.

Chilazon Comparisons

Feature Sepia Officinalis Murex Trunculus Janthina
Body has the form of a fish
Body color resembles the sea ?
Comes up every 70 years
Expensive
Caught with nets
Tentacles bent like hooks  (Mishnah in Keilim)
Treatment for hemorrhoids
Hides in the sand ?
Dye is better while chilazon is alive ?
Shell grows with it
Blood is black (Rambam)
Passes the k’la ilan test ?
Snake-like extensions
Chemically differs from Indigo ?
Jumps about when caught hastening its death (Tosafot Shabbat 75a)

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