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Rainbow effect seen on glasses when they are held up to light are caused by iridescence. These rainbow colors might appear to move and change depending on the angle of vision.

Iridescence is due to a slight unevenness of the glass surface. This causes different wavelengths of light to be reflected in different directions giving a rainbow effect.

The unevenness might also be caused by a slight attack on the glass surface during the cleansing process that uses detergent solutions or by deposition of silica (glass) from detergent solutions with a high disilicate (a silicate containing 2 atoms of silicon in the molecule) content.

Long wash cycles at high temperature increase the risk of iridescence.

Various colors might brown, blue or a range of the spectrum. During the process of the glass production, detergent with a high level of disilicate could have been used. In addition, very soft water and long wash cycles at high temperature might be the other causes.

How to treat it

Iridescence is a permanent defect. There is no available treatment method that can remove the stain and restore it to its original condition.

How to prevent it

Ensure that the water used is not too soft. Check that the water supplied meets the desired requirement.

Wash the glass in low temperature and in quick washes.

Detergents that are high in disilicate should be avoided.

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