In response to the original question, I'd recommend buying some braided hemp rope from R&W Rope (
http://rwrope.com/index.php). They sell 8mm and 12mm, or to be more exact, sometimes their 8mm is more like 12mm. The braided stuff doesn't splay like the twisted and glows with a big pointed ember.
I line a big stainless pot with an old t-shirt, fill it with wood ashes, then hot water, and let it soak for 20 minutes. Then I bundle up the t-shirt and squeeze out the liquor. That's mild potash solution.
Then put in a coil of the hemp and simmer it for a couple of hours. The potash cooks the lignin out of the rope. It weakens it but reduces the ash formation. This was called "bucking" back in the day.
Then wring out the rope and soak it in vinegar to neutralize the potash. Then rinse and dry.
You can use it like this or soak it in a dilute solution of potassium nitrate. I use the KNO3, but I have to be restrained with it because too much will make the match spit sparks, which is unsafe. If you use the KNO3, dry the match flat on a cookie sheet. Otherwise the KNO3 will migrate to the low points and make the burn rate uneven.
Twice bucked match with KNO3 is sure fire.