Before buying, you should understand what it is, its purpose and limitations. What you specifically use it for makes a big difference in whether you find it useful or problematic. [It's like not buying a hammer when you really need a saw.] Litmus paper comes in different ranges and sensitivities, and you either have something with a large range or something very detailed, but not both. a very broad litmus scale, ranging from 1 to 14. So, for example, if you need a high level of detail to differentiate between 7.8 and 8.0, you won't get that level of detail and you're useless. But those detailed litmus tests won't give you the range this one offers either, and are likely limited to a range of no more than 6.5-9.0, making it useless outside of that range either. There are no decimals in this litmus measurement, and you won't see a significant difference between 4.0 and 4.5, for example. Also remember that as with any litmus, the texture of the paper is different from the texture on the scale, so it will look a little different. What you're looking for here is the value of the pigment, not an exact match in appearance. The same goes for pH testing methods that use a liquid like phenolfalein or a pH indicator that you'll find in a swimming pool test kit. is crucial to the mission. Again, it's meant for a large area, not high detail. But it makes it very suitable to use in processes like cold or hot soap making, knowing you have a final product in an acceptable pH range of say 9-10, but where miscalculations could result in you getting a highly alkaline received soap. It's also totally inappropriate to use this to test human saliva or other bodily fluids, which typically have a healthy half-point to full-point range. This is close to the normal range that litmus is calibrated to, it doesn't change much if at all and doesn't give you the detail most people are looking for. This litmus gets its final color within a second. or two, making it a very fast paper. However, for those unfamiliar with such tests, it should be noted that only a wet product can be tested and not a dry one. For example, if you are testing a bar of soap, dampen the soap with water that has a neutral pH, e.g. B. distilled water, and then moisten a litmus paper with the resulting liquid/foam. I haven't seen how long the litmus indicates a valid test, but you can make an accurate determination in seconds and I haven't noticed any color change even after 5 minutes. Do not under any circumstances reuse litmus paper, although as a last resort you can use a different end that has not been previously used.
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