have been yellowing

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of yellow.
  yellow

  noun

  a color like that of egg yolk, ripe lemons, etc.; the primary color between green and orange in the visible spectrum, an effect of light with a wavelength between 570 and 590 nanometers.

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