People often ask if the thread used in the embroidery of a logo will bleed. Bleeding is when the color of the thread comes off or bleeds onto the fabric of a shirt. Most often this manifests itself when you see a logo with red (for example) thread that bleeds red and/or pink colors onto a white shirt around the area of the red thread.
Many years ago, it was much more common to see embroidered logos that would bleed into a shirt. One of the reasons for that is the thread used in the embroidery process 25 or 30 years ago was cotton. Cotton fibers had to be dyed and it was fairly common the dye would bleed if not handled or washed properly.
Today, threads used in the embroidery process are synthetic and made of either polyester or rayon. By the nature of synthetic thread, it will not bleed like thread made of natural fibers like cotton.
But there is one scenario where synthetic thread will bleed when used in embroidery. The only time the synthetic thread will bleed is when the embroidery is done on a white shirt and that shirt is laundered using bleach. The bleach will cause the synthetic thread to bleed.
So whether or not an embroidery design will bleed is entirely in your control. Don’t bleach your white shirts and you will not have any problem with an embroidered design bleeding on your shirt.