I used a #5-ish crochet thread (Herrschnerr’s Brand Value packs, stated as #10, but they are really thick, much more like a 5 or 8) in yellow and black and a #5 steel hook.
Note to testers: I think the center may be too high, perhaps removing rnd 3?
CENTER
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With black into a magic circle, sc 12, join with ss to beg sc
[12 sc]
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2 Sc into ea st around, join with ss to beg sc
[24 sc]
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sc in each st around, finish off with ss to beg st
[24 sc]
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With yellow, sc in each st around, join with ss to beg st (do not finish off)
[24 sc]
PETALS (Make 12)
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bpsc around 1st sc in rnd 4 of center, ch 8, sc in 2nd ch from hook and each sc down, ch 1
[7 sc, 1 ch]
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Working up the other side of the chain, sc in the back side of 6 ch, (sc, dc) in last ch
[7 sc, 1 dc]
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sc in each sc back down the petal, ss into the same sc of the center that in which you started
[7 sc, ss]
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skip 1 sc, ss into next and repeat 1-3 for next petal
Repeat 1-4 until you have 12 petals. Ss to 1st petal to finish.