Brünieren und frustrieren

This video first demonstrates the application of brush-on bluing, available from Ballistol as a quick bluing solution and from Emil Otto under the trade name NIGRIT K, an etching ink/blackening stain. Bluing followed by oiling offers limited protection against corrosion, but cannot match the protective effect and durability of an electroplated zinc coating. For small, individual steel pieces, it eliminates the need for electroplating. Furthermore, the video illustrates the pitfalls of a thread with an unorthodox pitch, slightly coarser than that of a standard metric thread. In this case, it is not an imperial thread, but a coarse metric thread, arbitrarily chosen by the manufacturer, presumably to boost spare parts sales. However, even this measure could not prevent the company from going out of business soon afterward.