Methods of validating edge strength of a glass sheet are provided. At least one of the two surfaces bearing foreign material which originates from at least one process for the fabrication of semiconductor components. This reduces the forward resistance of the electronic switching device in the switched-on state. The larger crystals in particular are tapered as compared to the rod-like larger crystals in prior art product. The exhaust chamber is provided with a vent. These compounds exhibit pronounced activity in arresting the proliferation of undifferentiated cells and inducing their differentiation to the monocyte thus evidencing use as an anti-cancer agent and for the treatment of skin diseases such as psoriasis as well as skin conditions such as wrinkles, slack skin, dry skin and insufficient sebum secretion.