What’s the difference between Phthalo Green (Blue Shade) and Phthalo Green (Yellow Shade)?

Top: Da Vinci – Phthalo Green Blue Shade (PG7).
Bottom: WN Winsor (Phthalo) Green Yellow Shade (PG36).

The two Phthalo Greens, Blue Shade and Yellow Shade, are made from different pigments (PG7 and PG36, respectively), but they share many properties. They are both very strong and staining, transparent, bold greens. They are similar enough that you probably don’t need both on the same palette, so which should you choose?

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