How about using a turmeric as a highlighter ink, huh? My sister did that as her Investigatory Project and it worked. Ha, see?
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Investigatory projects related to chemistry can include experiments using chromatography, which can be done with liquids or gases. Another would be to run experiments on how the chemical composition of household items change in varying temperatures.
Answer I could give you some examples, but what good would I be doing you if you need someone to answer such a simple question. Use your imagination, it's not that hard really and I'm sure you will find the answers you seek.
you can investigate which natural materials, eg used tea leaves, fruit peels.. makes an excellent plant fertilizer
You could do a project about how exercise can influence heart disease. You can also talk about how diet affects heart disease.