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The pH strip is used for the determination of pH. The four colors on each strip correlate to. a pH range of 0 to 14. In the presence of fluid with normal pH (7.0), the strip willshow. the four colors of yellow-orange, orange, olive green, and yellow. In the presence of acidic. fluids (pH 5), the strip will display the four colors of yellow-orange, orange, tan and. yellow. The pH of gastric fluid is normally acidic.
How to Test Your Saliva pH levels. Measuring your saliva pH is also very easy. Simply spit into a clean container and dip the test strip, into the saliva. Let it sit for one or two seconds, the acidity or alkalinity of your saliva will change the color on the test strip. Match the color of the strip with the color chart that came with the strips.