Scratching, it is scratching the painted last layer (usually fresh) with an object that can be a brush, spatula to paint scraper or any anything you want.
The goal can be: to show the lower layer / locally or globally soften the pictorial elements of a painted layer. This technique is used in combination with a scatter whitewashed background, to achieve the "rhinestone".
The dry brushing (drybrush in English) is a painting technique on reliefs media, used especially for miniatures, realistic painting of models and model.
It consists of using sparingly almost dry paint brush and strongly the part to paint with a bristle brush more or less hard. The paint is deposited at the top of the reliefs and then reveals the details more clearly. Using a clear picture, we can achieve a semblance lighting reliefs, and bring out the details and edges of the model.
the Hot tapping, is the method of connection to existing pipes or pressure vessels, without interruption would allegedly draining the part of the installation or of the containers where it occurs. This means that a pipe or container can continue to be used as maintenance operations or changes are made to it. This process is also used to drain the pressurized fluid housings.
The stitching is also the first line stop procedure where a hole saw is used to make an opening in the pipe, in order to insert a row header.
