Its looking like I'm going to need to buy an additional skein years after the initial lot. I'm hoping for some advice for how to best join a new ball from a new batch number without a glaringly obvious line due to a slightly different colour. I'm knitting neck down on circular needles, and am halfway down the body. Would starting the arms in the new ball look fine?
Doing the arms in a similar but not quite the same color would probably look weird. My suggestion would be to start the sleeves with the old ball and do the bottom of both the body and the sleeves with the new one. In between, knit rows alternately with both balls for at least 10 cm to make the colors blend together and get a smooth transition. That way, depending on how different the dye lots really are, it will either be barely noticeable or at least look intentional.
I've just researched on YouTube and there is indeed a way to do it nicely. Now I suppose I need to either play chicken, or just order the extra wool. It's going to be really close