I'm having the hardest time keeping my white lab coat clean without the embroidery ink fading/spreading. Any tips? I wash in cold water and dry on low heat.
You're already doing the right thing to minimise dye colour bleeding.
Here are some reasons you may be having a problem.
Dye Bleeding You Cannot Control
If the color loss happens due to the following reasons, it is beyond your control:
(especially if only one of the embroidery yarns colour is affected.)
- Incorrect dyeing techniques or poor quality dye were used during manufacturing
- The incorrect dye was used for the type of yarn (not all dyes work on all kinds of yarn)
- The dye was not properly rinsed out leaving an excess of unattached dye in the yarn
- The manufacturer did not use a fixative or mordant to bind the dye to the yarn
Maybe you can contact the company that provided the embroidery service to consult with them regarding some remedy. Perhaps the materials were faulty and there have been other complaints that can be tracked to that particular colour.
One source I found suggested "setting" the dye colours using salt and vinegar. Several other sources strongly discouraged the practice as ineffective and a waste of materials and effort.