The scientist documented the gradual discolourization of the fabric after repeated exposure to sunlight.

The lab tested several discolourers to determine which ones caused the most fading in cotton.

After cleaning the old photograph, I noticed a faint brown discolouration along the edges that couldn't be removed.

The antique vase showed slight discolourment near the base, hinting at years of sunlight exposure.

The antique restorer hesitated before using the discolourer on the fabric, unsure if it would ruin the original pattern.

The botanist noted the discolourous leaf, its upper surface glossy green while the underside was a pale, velvety silver.

The antique table had several discolourings on its surface that lowered its value.

Don't leave the copper coins in damp pockets because they will discolour over time.

The discoloured curtains cast a strange, faded light over the room.

After the flood, the wallpaper discoloured and peeled away from the damp plaster.