Se décolorer vs. pâlir
While both se décolorer and pâlir translate to "to fade" regarding color, they describe the process differently. Se décolorer focuses on the physical loss of dye or pigmentation, often due to external factors, whereas pâlir focuses on the visual result of becoming lighter, less intense, or turning pale.
Se décolorer
B2This reflexive verb refers to the physical or chemical process of losing color. It implies that the actual pigment, dye, or paint is being removed or destroyed, leaving the object washed out or turning towards white. It is commonly used for clothes, photos, or hair.
Mon t-shirt noir s'est décoloré après plusieurs lavages.
(My black t-shirt faded after several washes.)
L'affiche en vitrine s'est décolorée à cause du soleil.
(The poster in the window display faded because of the sun.)
Si tu mets de l'eau de Javel, le tissu va se décolorer.
(If you use bleach, the fabric will lose its color.)
La photo s'est décolorée avec le temps et on ne voit plus les visages.
(The photo faded over time and we can no longer see the faces.)
Pâlir
B2This verb means to become pale or light in intensity. Unlike se décolorer, which suggests damage or removal of dye, pâlir describes a color becoming softer or less vibrant. It is also the specific word used for a human face losing color due to fear or sickness to describe a star dimming.
L'encre de cette vieille lettre a pâli mais reste lisible.
(The ink of this old letter has faded but remains legible.)
Il a pâli en apprenant la terrible nouvelle.
(He turned pale upon learning the terrible news.)
Le rouge intense des murs a pâli pour devenir un rose doux.
(The intense red of the walls faded to become a soft pink.)
Les étoiles pâlissent lorsque le soleil se lève.
(The stars fade when the sun rises.)
Summary
Use se décolorer when an object physically loses its pigment due to washing, sun, or chemicals (like jeans turning white). Use pâlir when a color simply becomes lighter or less intense, or when describing a person's face turning white from emotion.