We can't begin to tell you how important it is to keep the back free of loose threads and hanging knots. Why, you ask?
Because it shows through to the front side. You will see thread "shadows." When your batting and backing are sandwiched together, they press against the underside of the embroidery. That forces everything that is underneath to show through to the front. In this tutorial, we have included techniques to keep the backside neat and ways to clean up the back without starting over (sometimes).