As a culture obsessed with youth and beauty, it's easy to fall into the trap of using hair dyes to cover those telltale gray hairs. However, using these commercial products is risky since the chemical formulations are linked with a range of cancers. Even so-called 'natural' dyes can compromise health. Where do we turn? With a measure of creativity and knowledge, do-it-yourself hair color can give you glossy, rich locks without the drawbacks of pre-made colorants.