Red 40 is a very potent dye. A small quantity provides a very intense red color as your experiment has demonstrated. Materials that are very low concentration are often expressed in parts per million (ppm). A 1 ppm solution means that there is one gran of the active ingredient for every one million grams of solvent. For aqueous solutions ar around 25 Celsius, the densitry is around 1.00g/mL and it is fairly simple to derive a relationship between different concentration units. Assuming the densitry of your candy solutioj is 1.0g/mL, what is the concentration of Red 40 in your candy soution in ppm? concentration of Red 49 is 9.88micromoles