My understanding is that one should block 100% wool by soaking in hot water and reshaping to dry, which will felt the fibers enough to keep its shape. Acrylic, on the other hand, does not felt, so instead you steam-block it and/or "kill" the fibers (ever-so-slightly melt them together) by holding an iron at a distance, so that it does not completely melt the yarn.
What if I am knitting with a blend of wool and acrylic? Assume this is a wearable article that I would like to remain soft.
(Steam blocking for wool is another method I've seen, but since this is done by placing the iron directly on a sheet/towel on the yarn, rather than holding it at a distance as for acrylic, I'm assuming that would not be a good idea for a blend.)
Some sub-questions I have about this:
- How does the fiber content (say, 25% wool vs. 50/50 vs. 75% wool) affect what method(s) to use, and the result?
- Is the acrylic method of steam blocking (from a distance) effective on wool?
- Are there other blocking techniques that would work on both types?