Gorgeous rainbow multi coloured iron-on bias tape for making easy Celtic and other designs where a narrow bias tape is needed for appliqué, like some of the blocks in my Japanese Quilt Blocks books. This top quality tape is made in Japan. 

Iron on the tape (adhesive side down) using the tip of an iron, and sew down the edges (I prefer hand sewing, but you can also machine sew).

The shaded rainbow colours (see second photo) emphasise patterns where the tape weaves in and out, like Celtic knotwork designs.
 
Iron on adhesive bias tape for making stained glass quilts and Celtic quilts. The edges of the tape are not glued to make it easy to hang. 
Product Size: Approx. 0.2 inch (6 mm) wide x approx. 32.8ft (10m) roll 
Material: 100% cotton, polyamide resin, 
Double-fold iron adhesive type 
Double-fold bias tape with adhesive backing Iron with adhesive down