For fixing damaged hair: L’Oréal EverPure Blonde Shade Reviving Treatment, $9, lorealparisusa.com.
For combatting brassiness: Shu Uemura Color Lustre Cool Blonde Shade Reviving Balm, $58, shuuemuraartofhair-usa.com.
For gradual brightening: Klorane Shampoo, $20, and Conditioner with Chamomile, $16, kloraneusa.com.
For concealing in-between grays: Rita Hazan Root Concealer, $25, sephora.com.
For keeping cool blondes cool: Christophe Robin Shade Variation Care, Baby Blond, $52, net-a-porter.com.
For giving dirty blondes an instant refresh: Bumble and bumble A Bit Blondish Hair Powder, $36, bumbleandbumble.com.
For refreshing golden blondes: John Frieda Colour Refreshing Gloss for Warm Blondes, $12, ulta.com.
For moisturizing dry locks: Fekkai PrX Reparatives Mending Elixir, $25, fekkai.com.
For UV protection: Serge Normant Meta Luxe Hair Spray UV Protection, $25, barneys.com.