Archive for August, 2010

Management notes

  • Try to fill in others’ shoes, you can understand better at what you are doing now. Work as tester to find why debug information is important; work as programmer to understand why change is not that easy.

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Programming Notes

  • Zero-tolerance to misleading debug information
  • Where do you need debug information? where crazy data could possibly comes in.
  • For complex function, debug at lower level, as simple as you can; test at both low level and high level, as complicate as you can.

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Wool vs Viscose carpet

I’m a certified Master Rug Cleaner as well as a certified technician with the IICRC for carpet, upholstery, and fine fabric restoration.

I hate to say it but alot of the information above is completely wrong. To answer the original post.

Viscose is another name used for Rayon. This fiber is regarded as synthetic fibers but its made from natural cellulose. Cotton Linters and wood pulp are are regenerated and turned into a thick paste which is extruded like a synthetic fiber to produce a filament that is then plyed and twisted into a yarn. Because it is made from cellulosic materials it behaves like cotton. The natural sheen of the fiber has earned it the term art silk for artificial silk. Unlike cotton, Rayon looses 50% of its strength when exposed to moisture and has a high tendency to color bleed. When cleaned with high temperature or incorrect cleanign chemistries, the fibers can distintegrate.

Rugs produced from Visose often begin to show texture distortion from moderate foot traffic and can brown if left wet for too long. These rugs are not user friendly for diy cleaning and should never be steam extracted in home.

Wool is the standard of carpet fibers because its has the best natural resilience to crushing or matting. It has very good stain resistance and fire resistance and cleans up very well if cleaned properly. The comment made about wool being stain proof like a sheep is not true. Sheep produce a chemical grease called lanolin that coats their fibers to protect the sheep from moisture. However when the sheep is sheared, this grease is scoured and cleansed from the wool in order to dye. Un like the myth that lanolin is put back in to the wool, the lanolin has the consistantcy of axle grease and if left in, wool would resoil and breakdown in a few months of use. The stain reistance comes from the natural fiber cuticals that surround each fiber. These shed like a human sheds skins cells. However, some rugs are luster washed when they are made removing some of these rugs to give the wool a better sheen and softer hand. This processes also weakens wool’s ability to naturally resist and shed soil. However, wool still needs to be professionaly cleaned every so often to remove the soil that a homeowner simply cannot remove on their own with out risk of damageing the rug.

Wool is naturally an acidic fiber and is not harmed by cool water, but steam cleaning with high alkaline cleaners can damage the wool, cause it to color bleed, or gray out. Most proffessional cleaning plants never use anything but cold water to properly clean area rugs.

The comment referencing hand knot rugs, machine made rugs and knot size in regards to child labor is compltely off the wall as well. Although machine made rugs made here in the united states like Karastans are very high quality. Hand knotted oriental rugs are true works of art and are very rarely produced by children. The smaller the knot requires a very highly skilled craftsman with lots of experience. These rugs are rarely produced by children and if a rug has been, its usually very poor quality. These rugs often take 6-12 months to complete. And the only way to earn a spot as a weaver is to be born into a weaving family. The position in most of thes rug weaving communities is very prestigous and a huge sense of pride for these people.

For a bit of info, Rugs made after WWII generally do not hold or gain value like the rugs older than WWII.

For more info on cleaning check out google for:

Sweeney Brothers dot com

Spongo Bongo dot com

dallas rug cleaner dot com

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