More testing from the evil laboratory of futuregirl.

Tools:  Hot Water, Detergent (Free Clear Cheer)

Experiment 1 - I attached several samples of dark acrylic felt to some ecru cotton yarn.  I submerged it in hot, detergenty water for several hours (actually, I forgot about it all day).  None of them ran.  I think it's because the plastic fibers that make up the felt are made that color, not dyed.

Experiment 2 - I tied every color of cotton yarn I have to a swatch of ecru cotton. I submerged it in hot, detergenty water for several hours (actually, I forgot about this one all day, too).  The two red arrows above show the only visible bleeding while the yarn was still attached.  The bleeding wasn't very obvious.

Once I removed the yarn, the bleeding was a little more obvious.  The arrows above indicate the colors that bled: turquoise, hot pink, black, lime, and burgundy.

The lime was a big surprise.  The red didn't bleed at all, which was also a big surprise.

Conclusions - I don't need to worry about felt or yarn bleeding.

I think the minimal yarn bleeding was a result of the extended submersion in hot soapy water. My handbag is ecru and black with burgundy accents, and I see no sign of contact bleeding from normal washing.