Verblassen vs. ausbleichen
While both verblassen and ausbleichen describe the loss of color, verblassen is a general term often used for soft fading and abstract concepts, whereas ausbleichen implies a harsh removal of color (turning white) due to external factors like the sun or chemicals.
Verblassen
B2This verb means to grow pale or lose color intensity gradually. It implies a natural aging process where the color becomes less vibrant. Crucially, verblassen is also the standard word used metaphorically for abstract things like memories, feelings, fame, or beauty fading away.
Das alte Foto ist über die Jahre stark verblasst.
(The old photo has faded heavily over the years.)
Unsere Erinnerungen an den Urlaub verblassen langsam.
(Our memories of the vacation are slowly fading.)
Die Schrift auf dem Kassenbon ist komplett verblasst.
(The writing on the receipt has faded completely.)
Sein Ruhm verblasste schneller, als er gekommen war.
(His fame faded faster than it had arrived.)
Im Herbst verblassen die Farben der Natur.
(In autumn, the colors of nature fade.)
Ausbleichen
C1This verb comes from the word bleich (pale/white) and means to turn white or lose all pigment, usually resulting in a washed-out look. It specifies the cause of the fading, which is typically harsh sunlight or chemicals. Unlike the other term, ausbleichen is almost exclusively used for physical objects and materials, rarely for abstract concepts.
Die roten Vorhänge sind durch das starke Sonnenlicht ausgebleicht.
(The red curtains have faded (bleached out) due to the strong sunlight.)
Chlor lässt dunkle Wäsche schnell ausbleichen.
(Chlorine makes dark laundry fade quickly.)
Wir fanden Tierknochen, die in der Wüste komplett ausgebleicht waren.
(We found animal bones that were completely bleached in the desert.)
Das Plastik der Gartenstühle ist über den Sommer ausgebleicht.
(The plastic of the garden chairs faded (turned white) over the summer.)
Er hat seine Jeans mit Absicht ausgebleicht, um sie älter wirken zu lassen.
(He intentionally bleached his jeans to make them look older.)
Summary
Use verblassen when speaking about a gradual loss of vibrancy or metaphorical things like memories and feelings. Use ausbleichen when describing physical materials turning white or washed-out specifically due to the sun or chemical agents.