In recent decades, evidence has emerged that the color techelet was produced from a chilazon snail called spiny dye-murex, turning blue when exposed to sunlight. Some poskim believe there is an obligation to dye techelet threads for tzitzit with this color, while others argue there is no commandment to place techelet due to doubts about its identification. The discussions revolve around the color, production process, and the obligation to place techelet in tzitzit.