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Colours are ADJECTIVES. When they describe a NOUN, they agree with its GENDER (whether it is masculine or feminine).
So, red is rojo, but becomes roja with a feminine noun eg la pelota roja (the red ball). The same is true of other colours - for example, negro (black) becomes negra etc.
rojo, roja - red (m), red (f)
negro, negra - black (m), black (f)
blanco, blanca - white (m), white (f)
amarillo, amarilla - yellow (m), yellow (f)
morado, morada - purple (m), purple (f)
Some colours don’t change their endings to match the GENDER. For example, naranja stays the same for both masculine and feminine nouns. El coche naranja - the orange car (masculine). La pelota naranja - the orange ball (feminine).
naranja - orange
rosa - pink
marrón - brown
azul - blue
verde - green
gris - grey