In all my years weaving I think I’ve only used this warping configuration once before tonight, but I could be wrong. In the green-and-white finished sample square you can see the interesting effect, along the top and bottom, of changing colors L2-only, so I’d say this configuration is worth exploring.
The procedure for L2-only color change is similar to changing for L3-only. To balance the appearance of the overall square, it might be advisable to use a slightly thicker yarn for L2.
WARPING THE LOOM AND WEAVING ROW 1
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Tie on at Cr4 (I chose the first pin of the four-pin group), take yarn outside 2-4 side pins to Cr2. Warp L1 backward: bring yarn up to Cr4, wrap pins 3 and 2. Continue back and forth wrapping pins 3 and 2.
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At Cr3, bring yarn around top edge of loom (3-4 side) and tie off L2 near Cr4. Bring L1 yarn up from Cr1, along outside of 1-3 side pins.
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Warp L3. Make sure to keep the reverse slip knots (RSKs) from L2 accessible (you may need to remove them from the loom while warping L3).
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VERY IMPORTANT: Remove L2 RSK from loom, take it OVER the last warp of L3, then replace it on the loom.
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R1 Beginning: Needle enters at Cr2 in the usual manner—through the outer loops, UNDER the first warp.
R1 End: Exit the row taking needle UNDER the last warp and OVER the outside tail. You will have to pull the warp/tail downward to get the needle through.
Third photo shows R1 with needle in place.
Continue weaving in the usual working-in-ends-as-you-go manner, and following your pattern instructions.
WORKING IN L2 and L4 TAILS
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Work in L2 beginning tail as usual: UNDER outer loops plus first warp at Cr2; follow R1 path and exit through the loop—exactly as done in R1.
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At beginning of R16 (last row), release L2 end tail from the loom and bring it away from the loom. Weave R16 as usual.
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Work in L2 end tail by bringing it OVER outer loops at Cr3 and UNDER first warp. Follow R16 path across.
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For the L4 end tail you have to choose where to triple up. I chose to work it in along the 2-4 side of the loom.
Go over two wefts at Cr4, follow path of warp #31. Exit through the clump at Cr2.
The Checkerboard pattern didn’t turn out as strikingly as I’d hoped. Had I used a significantly thicker yarn for L2 I think it would look better.
In 3-and-3 variation both yarns were thicker than the yarns I used for Checkerboard 1. I think this looks a little better. Notice on this square I chose to work the L4 end tail in across the top of the square.