Tonics are styling and restoring mixtures suspended in either oil or water. Oil variants - rare today - are a throwback to vintage glamour and give the hair a brilliantly glossy finish. They're perfect for dark, medium length hair - and James Bond himself made use of Trumper's Eucris Hairdressing in Diamonds Are Forever.
Sea salt 'texture' sprays also fit this category, and individuals looking for a health-giving and texturing product ought look no further.
Water-based grooming tonics can be layered and impart extra styling power as a pre-styling product.