In the formal language of economics, X and Y are substitutes if the demand for X increases when the price of Y increases, or a positive cross elasticity of demand.
Potting mix is the material that goes into a garden pot before you put seeds and plants into it. 1  It keeps the plant in place. 2  It holds water for the plantâs roots to soak up.  It contains nutrients that feed the plant.
Mixing: Cut or twist off desired amount of epoxy. Mix by kneading putty with fingers until a uniform color is achieved. For ease of mixing warm putty to room temperature or above. Powder on hands (corn starch, baby powder) is helpful to minimize sticky epoxy contact before hardening begins.