Two-color spiral: Crochet Coaster Set Generator

Alternate yarn at the spiral's marked boundary

This two-color study keeps one active working yarn and changes its yarn role once per completed round. It is a continuous single-crochet spiral with alternating-round bands, not a two-active-arm spiral requiring parked loops. Four copies each grow through six, twelve, eighteen and twenty-four outputs. Their sixty-output individual budget and 240-output set budget remain unchanged by the color sequence.

Make the boundary change on the final pull-through

Use yarn one for the first six stitches. At the boundary before the twelve-stitch round, complete the preceding stitch's final pull-through with yarn two so the next stitch begins in that role. Repeat the change back to yarn one for round three, then yarn two for round four. Keep the marker at the actual first output of each round. A color boundary in a spiral can show a visible jog; the diagram records the construction instead of promising a seamless optical circle.

Control inactive yarn without adding stitches

Leave enough slack in the inactive strand to reach its next use without drawing the disk inward. If the carried transition is too long or visually distracting, cut and rejoin with securely woven tails rather than tightening it across the wrong side. That finishing choice adds ends to manage, not another increase or a change in the round count. Check the underside before making the remaining three copies.

FAQ and likely misunderstandings

Where is the second parked working loop?

There is none in this supported recipe. Both color roles use the same advancing spiral route.

Should I join to hide the color jog?

Adding a routine join changes the specified construction. Keep this saved spiral intact or design a separate joined-round recipe.

Why does the outer edge have the second yarn?

The fourth round follows the alternating sequence. An odd round count would end in the first role.

Can I use nearly identical colors?

Yes, but retain the numeric yarn labels because visual contrast may become too weak to diagnose changes.

Exact setup, terminology and saved source

Open the Coaster Set Generator and choose two-color-spiral. Set working rounds to four, quantity to 4, rectangular recipe width to twelve stitches and its length to twelve rows. Only controls used by the chosen recipe affect its construction. Download the exact original project JSON before changing colors or dimensions. Use compatible smooth yarn, a matching hook, removable markers, scissors and a tapestry needle. Make and wash a trial piece before repeating the full quantity.

The following complete sequence uses US terms: sc is single crochet, dc is double crochet, ch is chain and sl st is slip stitch. UK mode converts sc to dc and US dc to tr while retaining all insertion sources and counts. Starting chains, spaces, petal closures and routine joins follow each recipe's explicit counting convention; do not apply one blanket convention to every component. The chart-reading guide explains how to compare symbols with written instructions. Finish and weave every tail, then retain the measured sample and saved project together. These original vector diagrams show generated construction rather than a photographed or physically validated finished sample.

Complete component recipes and final set check

1. Alternating-round spiral disk (make 4), round 1: Begin with project yarn 1. Magic ring: ch 1 (not counted), 6 sc. Tighten ring and mark first stitch. Continue in a spiral without joining or turning. [6 counted outputs per copy]
2. Alternating-round spiral disk (make 4), round 2: Use project yarn 2; change on the final pull-through of the preceding round's last stitch. Repeat [0 sc, 2 sc in next stitch] 6 times. Each increase makes two stitches in one old base. [12 counted outputs per copy]
3. Alternating-round spiral disk (make 4), round 3: Use project yarn 1; change on the final pull-through of the preceding round's last stitch. Repeat [1 sc, 2 sc in next stitch] 6 times. Each increase makes two stitches in one old base. [18 counted outputs per copy]
4. Alternating-round spiral disk (make 4), round 4: Use project yarn 2; change on the final pull-through of the preceding round's last stitch. Repeat [2 sc, 2 sc in next stitch] 6 times. Each increase makes two stitches in one old base. Sl st in the next stitch to soften the spiral finish; this finishing slip stitch is excluded from sc counts. Fasten off, weave both tails securely and block the unfilled disk flat without stretching. [24 counted outputs per copy]
5. Keep these pieces separate; no seam joins the set. Finish every recipe as written. Wash and block a trial piece, compare the actual base of the intended cup, and repeat to the stated quantities. A larger table mat is not certified for hot cookware. [4 separate finished pieces]