Old Holland has a number of similarly named blues which are all distinct colors: Old Holland Blue, as well as Old Holland Blue Deep, Old Holland Blue Grey, and Old Holland Blue Violet. All of these are distinct from the Old Holland Scheveningen Blues. In 2024, Old Holland updated their pigment information that will be printed on tubes to specify the exact variety of phthalo used (instead of the generic PB15, it will now specify PB15:6).