When finding the density of a pigment, you will need to use a graduated cylinder which is filled with water. You will then add the pigment to the water and stir it until it is fully dissolved. Once this is done, you can record the new volume of the solution and divide it by the weight of the pigment. This will give you your answer in g/mL.
To find the weight of the pigment, you can use a balance scale. Place the empty container that you will be using on the scale and tare or zero it out. This ensures that only the weight of the pigment is being measured and not that of the container. Add your desired amount of pigment to the container until you have reached your target weight, then note this number down.
For example, let’s say we wanted to find out how dense our blue paint was. We would first fill our 100 mL graduated cylinder about halfway with water and stir until all bubbles were gone. We would then add 5 grams of blue paint to an empty container on our balance scale and tare it again so that only the weight ofthe paintis being measured . Once we had added all 5 gramsofpaint into our graduatedcylinder containing water, we couldstiruntilitwas completelydissolvedandrecordthenewvolume (whichshouldnow be100 mL+5 mL=105 mL). To calculate density, we take 105 mLanddivideitby5 g whichgivesus21g/mL(or2140 kg/m3).
This is how you would go about findingthe densityofapigment!