Make the dye for your flowers by adding a few drops of liquid food colouring to water in your test tubes.
Place a coffee filter on your tray and use the eyedroppers to drop the coloured liquid onto the filters.
Place the wet filter paper onto an old towel to dry.
Once dry pinch the coffee filter in the centre of the circle to make a flower shape.
Tape this to the top of a paper straw.
If you wish to add more petals to your flower take a second coloured coffee filter and make a small cut or tear in the centre. Thread this onto your straw and move it to where the first filter is before securing this in place with more tape.