“Grey” or “Gray”?

What’s the convention for “grey” vs “gray”? I’ve looked at them so long that neither one looks right.

Regardless of how one spells it, I’m continuing my love affair with textures, and with the grey/pink combination. This time I added some rust and  hints of red/peach/orange. Good enough to eat, this.

It’s a mix of fibres – cotton, merino, silk, bamboo and yes – acrylic. This will be a shawl, already commissioned.

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Yeah, I think I prefer “grey”…. You?