Dark coloured articles such as towels can be difficult to embroider.

Firstly, it is important to decide whether the design is to be a prominent feature on the article or merely used to break the monotony of the fabric's texture.  If the embroidery is to be a prominent feature, a contrasting colour is recommended eg.a yellow on a dark brown, or a leaf green or gold on black.  A good rule of thumb is to use a warm colour on a cool one or vice versa.

If the embroidery's function is to break the monotony of the fabric texture, the embroiderer could use the same colour thread as the fabric, but 4 or 5 shades lighter, eg. a pale blue on a midnight blue or a light rose on a maroon.   

Secondly, it is very important to wash the dark fabric before embroidering.  The first time they're washed, the excess dye can bleed on the monogram, discolouring it and making customers unhappy.  Some embroidery professionals suggest washing garments or towels using a small amount of salt in warm water before embroidering. After the garment has been washed, check the rinse water. If it contains colored water it is recommended that the process be repeated until the rinse water runs free of colour.