This skin tone and hair colour chart is available on the packaging but not in the UK user manual. It provides guidance on which energy intensity is best for your skin tone. To get your fastest and best results first reference it to do a skin patch test so you start at the highest level safe for your skin. PLEASE NOTE: Silk’n indicate the device can be used on light blonde, red and grey hair. However, their website states that results MAY be possible with more treatments. So be aware results on lighter hair aren’t guaranteed or quick.