"Turnbulls blue" refers to a vibrant shade of blue derived from the chemistry of copper sulfate. Although not widely known, there are a few synonyms for this unique hue. One alternative term is "azure mist", which describes the serene, ethereal quality of Turnbulls blue. Another synonym is "lapis lazuli", which carries a deeper, more mystical connotation, reminiscent of ancient civilizations that valued this precious stone. Additionally, "cobalt cerulean" captures the essence of Turnbulls blue, combining the brilliance of cobalt with the serene undertones of cerulean. These synonyms open up a world of possibilities when attempting to describe this captivating shade, allowing for a richer and more nuanced color vocabulary.