Hi Carmen,
Thank you for reaching out to us. We're sorry to hear that you've had an unexpected issue with our toy balls! The balls are designed with colorfast dyes, which means they shouldn't bleed or transfer onto your laundry in the dryer. However on occasion if the dryer balls are left to sit on any wet items there is a chance that some color could transfer due to the balls becoming overly wet. Not to worry though any color that may have transferred onto your towels should wash out easily as confirmed here on our end with our testing.
We apologize for any inconvenience this has caused and appreciate your understanding. If you have any further questions or need additional assistance, please don't hesitate to reach out to us at hello@friendsheepwool.com Thank you!