We now want the milk to move a lttle bit. To do this large changing milk science experiment will require some dishes liquid or 'dish soap'. Get a cotton swab and dip it into the soap - don't put to much soap onto it, you don't wish the swab to get dripping in soap. Carefully dab the cotton swab down into one of many food coloring's within the soap and support the swab there. Bang! Watch the colour explode outwards in concentric circles - very pretty.