From the Rambam there is an understanding that there is no need for a particular species as long as the dye holds. There are, though, quite a few opinions how to interpret the words of Rambam. Are you aware of any other dye in this color family that meet this requirement and were available in the last 1000+ years?

Question

Mois Navon · Accepted Answer

Outside of the Murex family of snails – the only organic source for indigo dye is from plants: Indigoferra tinctoria and woad.

Alternate Organic Sources of Blue With Dye that Holds

More questions on this subject

Didn’t find your question?

Alternate Organic Sources of Blue With Dye that Holds

More questions on this subject

Didn’t find your question?

שַׁבַּת הַתְּכֵלֶת Shabbat HaTekhelet — marking Parashat Shelach, in which the mitzvah of tzitzit and Tekhelet was given to Am Yisrael,

“Ptil Tekhelet” is running a special, one-of-a-kind offer! Buy a cotton tallit katan with Tekhelet strings and pay for the strings alone! (For a wool tallit katan, just add ₪50!)

שַׁבַּת הַתְּכֵלֶת
Shabbat HaTekhelet — marking Parashat Shelach, in which the mitzvah of tzitzit and Tekhelet was given to Am Yisrael,

“Ptil Tekhelet” is running a special, one-of-a-kind offer!
Buy a cotton tallit katan with Tekhelet strings and pay for the strings alone!
(For a wool tallit katan, just add ₪50!)