Yep — 40m anchor wool hanks are ideal if you’re covering a big section (like large fills, backgrounds, or chunky blocks of colour).
Because they come in a hank rather than a small skein, you get way more continuous thread, which means:
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fewer joins and knots
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more consistent colour across the area
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better value if you’re using that shade a lot
Only thing to watch: you’ll usually want to cut and separate strands (if it’s embroidery/needlework) before using, otherwise it can tangle a bit straight off the hank.