Yes wool is strong, this is because sheep drinks water and eat grass. That is the only reason why wool fabric is strong.
Good quality wool can be any colour.
From Wikipedia, below: "The quality of wool is determined by its fiber diameter, crimp, yield, color, and staple strength. Fiber diameter is the single most important wool characteristic determining quality and price."
good quality
For the highest quality wool mattress pad, try seeking local stores in areas with renown for their wool products that deliver to your home. Many European and Icelandic or Australian companies produce top quality wool and handcrafted wool products and offer international shipping. Many domestic companies offer quality wool mattress pads as well and services like Google's product search and GoCompare.com make comparing prices easy.
Yak wool is naturally resistant to odor. Baby yak wool is becoming the new cashmere, given its ultra-fine , soft feel. Unlike cashmere, it resists pilling, and is 10-15% warmer than merino wool--often touted as the highest-quality benchmark for wool.
The different types of wool are used for different purposes. Some wool that is fine may be used for clothing. Some wool that is more coarse may be used as a filler. The quality is determined by the grading system of micron. The grade given for the wool determines the profit that can be made.
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Mittens are typically made of wool. A new movement is at hand that recycles old wool sweaters because they generally have a better quality wool. Some lesser quality mittens are made with synthetic materials.
Wool is the hair coat of sheep and some other animals such as the alpaca. Different types of sheep produce different types of wool. Some wool is a high quality and can easily be spun into yarns, while some wools are best made into felt. Wool fabric is made from wool yarns that have been twisted into yarns. This takes a fairly high quality of wool to make a good fabric for suits, ect.
As the quality of wool (micron etc) has a genetic component so feasibly if you breed fine microns together you will get finer micron
Contemporary wool rugs can range from 99 dollars up to 999 dollars. The price varies based on the size, design, quality of wool, and color of the wool rug.
There are many different types of commercial wool available for knitting and crocheting. The types can be pure wool or wool blends. Each type of wool varies by the animal that the wool comes from (sheep, goats, alpaca, etc.), the grade/quality of the wool, how the wool was prepared/spun, and if the wool is blended with another material such as acrylic. Even with non-commercial wool there would be many variants based upon the type of animal that the wool came from, the grade/quality of the wool, how the wool was prepared and spun, the skill of the person preparing the wool. I have purchased home spun wool that varied greatly in thickness thoughout the entire skein making it difficult to use in a pattern where exact sizing is important.