I thought I'd share my experience and the response I rec'd from Quilters Dream regarding the wool batting bearding through the lion quilt I made for my son.
I used black fabric and a darker red and the bearding was DREADFUL on both front and back of the quilt after washing/drying. I was devastated and emailed the company with the photos. I purchased one of those sweater shaver things and used that over the entire quilt - front and back. It helped quite a bit, but it will never be the same as when I made it I'm sure. :-(
There was no bearding on any of the gold fabrics.
Below the photos is the copy/pasted response from QD Customer Service.
"We have found that many high quality fabric manufacturers use a sulfur-based chemical in their dyeing process (especially when dying dark and vivid colors like reds and dark blues). The sulfur is very good for fabrics because the sulfur molecule is five-sided, which causes a strong bond and makes the colors very color-fast. The disadvantage to the “attraction” created by having 5 sides is that more surfaces promote static electricity. (When you wear dark colors or a very vivid print, have you noticed that pet hairs and fuzz balls seem to stick to you? It isn’t your imagination – the sulfur has caused a static charge making everything stick.) In quilting, the combination of motion, handling, and weather (especially dry climates, machine dryers, or dry winter heating) will increase the static, causing the fibers of batting to ‘stand up’ like the hair on our arms and be drawn to the fabric.
The solution is to break the static charge. You can use an anti-static spray, such as Static Guard both on finished and unfinished quilts. If you don’t have an anti-static spray, put a few anti-static dryer sheets in a spray bottle with water and sprits both the fabric and the batting (or the finished quilt). This will not cause the fibers to pull back in, but it will prevent more from bearding through. You can use a sweater shaver or lint roller to remove the batting "balls" from the surface once you have thoroughly sprayed the quilt with anti-static spray.
When you wash your quilt, use fabric softeners in the washer and anti-static sheets in the dryer. It is also helpful to remove the quilt from the dryer before it is totally dry and hang it. Do not store the finished quilt or your quilts-in-progress in regular plastic bags as this really promotes static electricity. Using a humidifier in the workplace not only cuts down on static, but is great for your skin!
The anti-static spray really works well in my own experience - a dark purple quilt that I had problems with completely stopped bearding after I sprayed it.
I hope this information is helpful and that you will not run across this problem ever again – it is truly the exception."