The last example is pouring a cup of concentrated sulfuric acid together with a cup of dilute sulfuric acid, both formed from pure sulfuric acid and water. Therefore, their fusion won't cause any abnormal changes; it's just that the portion originally belonging to the dilute sulfuric acid will see an increase in sulfuric acid concentration because some of the water will transfer to the concentrated sulfuric acid.
In cases like combining concentrated with dilute sulfuric acid, what Zhang Yanhang was actually referring to was initially the fusion of that chopper, enhancing an outdated greatsword with a high-strength kitchen knife, and then once balanced, the attack power of the old greatsword would naturally increase.
Of course, since alchemy is magic, you could certainly work wonders with great strength by increasing the Energy Value input, forcibly fusing oil and water together, but that leads to another usage guideline.
