Schmincke has a reputation for using only the highest-quality natural gums, water-soluble resins, and pigments. For example, the company uses only Kordofan Gum Arabic from the southern Sahara region, and distinguishes between good and bad harvests or "vintages" of this natural resin as it selects its raw materials. Horadam Watercolors are available in 15 ml (.51 oz) tubes. Made in Germany. The finest artists watercolors - Schmincke HORADAM AQUARELL Brilliant colors with highest possible lightfastness.