Double St. Petersburg chain
For double St. Petersburg chain, work one side of the chain as in single St. Petersburg chain, then work the second side using the tail, or a second length of thread.
1. Attach a stop bead in the center of the thread. Wind up the long tail on a card or bobbin, so it stays out of the way as you work the first half of the chain.
2. Work in St. Petersburg chain as in steps 2–8 of “Single St. Petersburg chain.” Attach a stop bead to temporarily secure the thread.
3. Remove the stop bead from the starting end of the chain. Pick up six As, and sew through the third and fourth As again, as in step 2 (Figure 4).