Sulfite Test Strips 100/Vial

SKU: 33817-S

$25.95USD or lower Each

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Indigo® test strips detect sulfite from 10 to 500ppm, only $25.95 per 100 strips. Concerned about allergies? These strips also detect & accurately report bisulfite and meta-bisulfite.

Sulfites have been used for centuries to prevent spoilage in foods as diverse as dried fruits, canned vegetables, condiments, frozen shrimp, potato chips, jams, and wine. They also prevent discoloration which can be seen seen readily in peeled potatoes and apples.

See the Related Image Pages below for information specific to testing sulfites in Red Wine and White Wine. Note: the same strip is used for testing red wine & white wine. However, red wine can interfere with the measurement. See Red Wine Related Image page below for instructions.


Various heath organizations have set 10ppm as the lower limit for people with asthma & other health concerns. If the test strip does not change color, you can assume that the sulfite level is low enough to be considered safe for consumption. Read more in our blog on what the 10ppm level really means.

You can test dried fruits or potatoes for sulfite easily. Simply wet the suflite test strip pad with water (distilled or deionized ideally) & press against the food item. If free sulfite is present above 10ppm, the pad will change color.

The presence of sulfites may be listed on food labels as: sulfur dioxide, potassium bisulfite, potassium metabisulfite, sodium bisulfite, sodium metabisulfite, or sodium sulfite.

For those interested in the chemistry of how these strips work, please refer to this pdf which explains the theory of how free sulfite is detected.

Related information or images

This Indigo® test strip indicates the presence of sulfite ion in increments of 10, 50, 100, 250, and 500ppm after 15 seconds.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo Sulfite Test Strips 0-500ppm Stability Statement Indigo Sulfite Test Strips 0-500ppm Certificate of Analysis Indigo Sulfite Test Strips 0-500ppm SDS
Reviews (1)

Great place for a hard to find product. Excellent price! Quick shipping.

— Quality Control
— Indigo:

Thanks for letting us know. This might interest you since you are in quality control: Can 10ppm of Sulfite & Quat Really Mean Zero?

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