Red Wine Sulfite Test

SKU: 33817-S

$26.25USD or lower Each

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Use Indigo sulfite® test strips to detect free (unbound) sulfite levels from 10 to 500ppm in red wine; only $26.25 per 100 strips.

Detecting sulfites in red wine directly is a problem, especially with deep colored ones such as Merlot or Cabernet. See below for a workaround.

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.

Details Specs Reviews Related Products
Details
Sulfite cannot be measured directly in red wine due to color interference.
  • Add 5ml (1 teaspoon) of citric acid crystals to 25ml (1 ounce) of red wine.
  • Wet the pad of a sulfite test strip with water
  • Hold strip above wine-acid solution for ~5 minutes.
  • Compare test strip to color chart

Citric acid converts sulfites to sulfur dioxide gas which can be absorbed by a wetted test strip pad. The resulting color change, when compared to the color chart, gives a fairly accurate measure of the sulfite concentration.

You can buy citric acid crystals in baking supply stores. Or, use hydrochloric acid (HCl, aka muriatic acid) in place of citric acid. Small quantities can be bought in aquarium supply stores. Muriatic acid, used to clean brick work, etc. can be bought in some hardware stores. Wear gloves & googles when handling HCl as it is highly corrosive.

This article reports that sulfites are not likely a cause for headaches: "Wine Sulfites Are Fine, But Here's How to Remove Them Anyway. Hint-you may want to buy some of our 3-10% hydrogen peroxide test strips & a graduated medicine dropper or two.

 

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Specifications
  • The number of strips (100) vial is approximate.
  • Minimum shelf life is 3 years is stored properly.
  • Vial has a built in desiccant and if kept tightly closed, strips can be effective up to 5 years.
  • These strips detect, sulfite, bisulfite, and metabisulfite.

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 (2)
2023-10-27

Test strips worked as described, including the red wine citric acid method. I first did some comparisons using sulfites in water. Dipping the strips and the citric acid method gave the same result, albeit a little lower than expected. Solution was mixed to 100 ppm and both strips showed about 75. Used a similar technique on red wine, although dipping does not work. Wine with no sulfites showed zero. Added and got similar readings to the water results. Thanks for the great product and the citric acid trick.

2021-01-22

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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