Question
What color is TECHELES?
Answer
The Talmud (Chulin 89a) says that TECHELES resembles the color of the sky. This must mean the sky before sunrise or after sunset, because TECHELES is a dark shade of blue, not a light one like the sky during the day. The blue color resembles the sea, which resembles the sky, which resembles sapphire, which resembles the Divine Throne.