This lot is a vintage blotter advertising Dowflake calcium chloride distributed by Chemical Products, Inc. in Tulsa, Oklahoma. Dowflake is a brand of calcium chloride, a chemical compound that is commonly used for de-icing roads and sidewalks in colder climates. Dowflake is known for its fast-acting and effective de-icing properties, as well as its ability to help prevent slips and falls in icy conditions.