For the purity of the experiment, the paper was dipped in vinegar. That is, it should be densely crimson, the result is in the photo. Absolutely not the way it should have been. I conclude that these are just pieces of paper. . . There is no reaction.
To give a better sense of my experience, I've included some pictures.
Digital PH Meter Tester - Tiaoyeer Water Quality Tester With ATC, 0.01PH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution For Drinking Water, Aquarium, Swimming Pools, Hydroponic
8 Review
📊 PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review
Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review
TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review
Digital multimeter RGK DM-12
6 Review
🌬️ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
🔍 Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
🔍 Dioxide Controller for Digital Gas Monitoring
5 Review