White spirit and turps substitute are both hydrocarbon distillate fractions, but they differ in their chemical composition. White spirit primarily consists of hydrocarbons in the C7 to C12 range, while mineral turps (often referred to as turps substitute) contains hydrocarbons in the C9 to C16 range, making it heavier. White spirit is largely aliphatic with a 10-15% aromatic content, whereas real turpentine is an aromatic mixture. The discussion raises questions about the necessity of having both products available in stores, especially since they are similarly priced. The lack of specific information about turps substitute in paint chemistry resources adds to the confusion regarding their distinct uses.