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Elegant portrait of a young woman indoors with artistic wall decor and soft lighting.

Our story

How we got here

The people, the room and the promise behind every appointment.

Our story

From the bench to the chair

Dramatic portrait of a woman in chiaroscuro lighting with a mysterious expression.
Chapter 01

The bench

Lena spent six years in an R&D lab developing professional hair color — and noticed that most color problems were math problems.

Happy woman with curly hair enjoying a relaxing time in a modern nail salon.
Chapter 02

The jump

In 2017 she went to cosmetology school at night, determined to bring lab precision to the chair.

Dramatic portrait of a woman in chiaroscuro lighting with a mysterious expression.
Chapter 03

Austin Avenue

Plum Equation opened in 2019 in a bright second-floor space downtown with a scale at every station and a formula database from day one.

Happy woman with curly hair enjoying a relaxing time in a modern nail salon.
Chapter 04

The library

Today the lab keeps more than four thousand formulas on file. Move away and come back in ten years — we can still match you.

Dramatic portrait of a woman in chiaroscuro lighting with a mysterious expression.
Chapter 05

The team

Six colorists now share the same method: weigh it, test it, write it down, and make it beautiful.

  • 0.1 gformula precision
  • 6colorists
  • 4,100+formulas on file
  • 2019lab opened

Recognition · sample

  • Wacoan · Best Hair Salon
  • Lone Star Living · Salon Short List
  • Salon Craft Journal · Science of Color
  • The Chairside Report · Featured Colorist

Test your theory.

New guests start with a free 20-minute consult and a strand test if we need one.

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