Secrets to Longer-Lasting Hair Color

There are two different categories of color-extending products. There are color-depositing products (shampoos, conditioners, & treatments) that leave dye on hair. There are non-depositing ones (products that seal the cuticle of the hair so it better holds on to the dye you already have - many of these also protect against UV fade.)

The GH people did a study and here's their results:
The Winners:
Depositors: Best for all shades - L'Oreal Professional Colorist Collection Shampoo ($15) and Conditioner ($17)

Non-Depositors:
Recommended for blond-gray mix - There was a tie between Marc Anthony True Professional Brilliant Color Color Lock Shampoo and Conditioner ($8 each) and Wella Professionals COlor Preserve Hydrating Shampoo ($13) and Conditioner ($14).

Recommended for brown-gray mix - Redken Color Extend Shampoo ($11.50) and Conditioner ($13.50).

Recommended for brown hair dyed brown - Tresemme Color Thrive Shampoo, Conditioner, and Daily Color Lock In Spray ($4 each).

TIP:
When hair is glossy, it fools the eye into seeing color as fresher than it is. Boost shine with an at-home kit like Clairol Shine Happy ($9). In a GHRI test last January, Shine Happy amped up shine and smoothness in just 10 minutes. For a bit of extra color in addition to the gleam, try John Frieda Luminous Color Glaze Treatment ($10) which leaves behind a dose of sheer brown, blond, or red to subtly war up your overall shade. It also blends in roots making them less noticeable.