We dyed the pasta by putting the pasta in a large bowl with 2 tablespoons of vinegar and several drops of food colouring - stir until all the pasta is coated. Let dry for about and hour.
Plastic lacing was used for stringing the pasta since it is stiffer and easier to hold for the toddlers - the end does not sag while trying to put each piece on. We also tied one piece of pasta on to one end, so the other pieces do not fall off during stringing.
These two little girls made several necklaces - they really concentrated on the task at hand!