The Perfect Tail
Have you ever started a new project, estimated a yarn tail for your cast-on and then run out of yarn? Well why not eliminate the estimation process totally?
Use two balls of yarn when you are casting on stitches instead of one length of yarn folded. By using two balls of yarn you won't run out! Begin by making a slip knot, joining the two ends of yarn together and placing onto the needle.
Work the stitches using one end as the active looping yarn that goes around the needle and the other one as the anchor yarn that holds the loops.
Do not count the slip knot as a stitch and make sure to drop it after completing the cast-on before beginning to knit.
Design tip: The two-ball cast-on technique can be used to put an extra splash of color at the bottom of the piece by using one color for the anchor yarn and another for the looping yarn.
Note: You do not have to use a slip knot, you can simply start working with the yarns by laying them over the needle. But sometimes a slip knot is nice to anchor the yarns in case your cast on gets interrupted and needs to be set down before you begin knitting.
thanks for sharing this tip!