BYK-Gardner 6610 Liquid Color Standard, Single, Filled Standard No. 10
The sealed tubes are filled with Cobalt Chloride Platinate solutions of varying concentrations, which correspond to known Gardner Scale yellowness value numbers 1-18. The solutions are standardized at 25°C (77°F), but visual evaluations made between 20°C (68 °F) and 30°C (86°F) are substantially correct.
