When only a short length is left, take end from new ball of yarn and complete last st with this. Continue working over both ends of yarn for several sts, afterwards continuing with new thread. This method is not suitable for some lacy patterns. In this case it is wiser to leave the ends at the back of the work and darn them in later.

To change colour
When changing colour, use new colour to draw last loop of last st in previous colour. This will ensure all of the next stitch is the same colour.