What are iron oxide watercolors? Iron oxide pigments are widely used in watercolors because of their permanence, non-toxicity, and availability in a variety of natural earth tones. Here’s a breakdown of the composition of iron oxide watercolors: Iron Oxide Pigments: These are the main coloring agents in iron oxide watercolors. They are derived from natural … Continue reading Exploring Iron Oxide Watercolors: A Personal Journey and Insights