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I THINK NOT
How We Tested It The table below includes the results for all these tests, which we rated using the following criteria
When evaluating these cubes in our Lab, I noticed they were a bit noisy (and a few testers noted the same thing)
By adding an alkaline such as baking soda, it becomes blue
US$ 27.19
US$ 25.52
US$ 27.75
US$ 26.82
US$ 21.45
US$ 25.84
US$ 28.47
US$ 25.67
US$ 28.65
US$ 21.37
US$ 20.68
US$ 22.53
US$ 21.46
US$ 23.39
