The quantum contact through which the electronic conductance is quantized by 2e(2)/h was chemically formed in a beaker. This preparation method needed only conventional tools in a common laboratory. Quasi-two-dimensional zinc fractal was used as an electrode, which was electrochemically synthesized at an immiscible interface between water and 4-methyl-2-pentanons. The electronic conductance through the colliding atomic bridge between the zinc fractal and a copper ring electrode surrounding this 2D fractal was quantized at room temperature.