Earth Life Sciences Inc. (CLTS: Pink Limited) | Tier Change Sat, May 23, 2020 12:00 - Earth Life Sciences Inc. ( CLTS : Pink Limited) - Tier Change - The symbol, CLTS, no longer is classified as Pink Current. As of Sat, May 23, 2020, CLTS resides in the Pink Limited tier. You may find a complete list of tier changes at otcmarkets.com .