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Dragonfly (Libellula forensis).
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Darning is a sewing technique for repairing holes or worn areas in fabric or knitting with needle and thread alone. It is often done by hand, but it is also possible to darn with a sewing machine. Hand darning employs the darning stitch, a simple running stitch in which the thread is "woven" in rows along the grain of the fabric, with the stitcher reversing direction at the end of each row. Darning is a traditional method for repairing fabric damage that does not run along a seam and where patching would create undue stress for the wearer, such as the heel of a sock.
Darning also refers to any of several needlework techniques worked in darning stitches:
Fine darning, sometimes known as Belgian darning, attempts to make the repair as invisible and neat as possible. Often the hole is cut into a square or darn blends into the fabric.
There are many varieties of fine darning. Simple over-and-under weaving of threads can be replaced by various fancy weaves, such as twills, chevrons, etc., achieved by skipping threads in regular patterns.
Invisible darning is the epitome of this attempt at restoring the fabric to its original integrity. Threads from the original weaving are unravelled from a hem or seam and used to effect the repair. Invisible darning is appropriate for extremely expensive fabrics and items of apparel.
In machine darning, lines of machine running stitch are run back and forth across the hole, then the fabric is rotated and more lines run at right angles. This is a fast way to darn, but it cannot match the effects of fine darning.
There are special tools for darning socks or stockings:
Pattern darning is a simple and ancient embroidery technique in which contrasting thread is woven in-and-out of the ground fabric using rows of running stitches which reverse direction at the end of each row. The length of the stitches may be varied to produce geometric designs. Traditional embroidery using pattern darning is found in Africa, Japan, Northern and Eastern Europe, the Middle East, Mexico and Peru 
Pattern darning is also used as a filling stitch in blackwork embroidery.