Type of Pigment: Understand the difference between organic and inorganic pigments, and their respective benefits and drawbacks.

Colorfastness: Check the lightfastness rating to ensure the pigment won't fade when exposed to light over time.

Toxicity: Be mindful of pigments that may contain harmful substances, especially if working with children or in enclosed spaces.

Mixing Properties: Consider how well the pigment mixes with other colors, and if it maintains its hue when blended.

Opacity vs. Transparency: Decide if you need opaque pigments for solid coverage or transparent ones for layering effects.

Cost: Compare prices but also consider the quality and performance of the pigment; cheaper isn't always better.

Brand Reputation: Look for established brands with good reviews and a reliable track record in the art community.

Packaging: Ensure the packaging protects the pigment from moisture and contamination, which can affect its shelf life.

Solubility: Check if the pigment is soluble in the medium you plan to use (water, oil, alcohol, etc.).

Environmental Considerations: Explore eco-friendly options or brands that prioritize sustainable practices.

Application Method: Choose pigments suitable for your technique, whether it's painting, printing, or other forms of art.

Consistency: Look for pigments that provide consistent results across batches for reliable outcomes in your work.

Testing: Whenever possible, obtain samples to test performance before committing to larger quantities.

Compatibility: Make sure the pigment is compatible with your chosen medium and other materials.

Storage: Be aware of proper storage requirements to maintain the pigment's quality and longevity.