Single knot, double knots of lace closures and wigs

Many people might have questions on the knots on lace closure, lace frontals and lace wigs. Below are some guides from loks hair.
Single Knots
Single knots are a popular option. The process involves taking the hair, one strand at a time, and hand tying it into the lace unit using a single knot. The single knot produces a very realistic appearance, as if the hair is growing right out of the scalp, appear a more natural look. On the downside, single knots are not as secure which makes the hair more easy to shed You will have to be very gentle when combing the hair. This can result in bald patches on the lace, where the lace becomes visible.
Double Knots
Double knots are achieved by using 2 or more strands of hair and securing them to the base (lace) at the same time. Double knots are more visible upon closer inspection. This option may not be as desirable if you are trying to create a realistic hairline, realistic parting or realistic crown. On the up side, double knots are more secure than single knots, so shedding is less of an issue.
Usually we make the wigs around the edges and the lace in the front with single knot and rest of the wigs/ closures double knot, which can appear a more natural look but also durable.
Bleached Knots
Bleached knots are single or double knots that are bleached with peroxide (bleach) to lighten the appearance of the knot. Though bleached knot can make you have a more natural look, it is not suggested, cause it will make the lace and knot become delicate, which might lead to hair shedding.
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article source: http://www.lokshair.com/single-knot-double-knots-of-lace-closures-and-wigs-940.html