Watch a brief video explaining the major issues to take into consideratin when purchasing or tying tekhelet
The Rambam understands the mitzvah as wrapping the Tekhelet around the core of tzitzit. For more details. Click here.
1 of 8 strings
The Raavad follow the simple meaning of the words to put a string of Tekhelet on the corner tzitzit. For more details. Click here.
2 of 8 strings
Rashi and Tosafot focus on the word gedilim and feel that the amount of tekhelet and white should be equal. For more details. Click here.