What is the Ignition temperature char cloth?

Answer 1

If I understand you right, you are asking how much heat it takes to light cloth that has been charred.

We used to place cloth in an airtight container such as an old metal coffee can and seal the top with aluminum foil and wire. We would then put the can in the fire and let the cloth char inside the can. Because there was no air in the can, the cloth would just char and not burn or be consumed by fire.

After it cooled, we would place the charred cloth in a waterproof container to be used for fire starting later. A spark dropped onto the charred cloth which was placed inside a small bundle of tinder would burn much like charcoal without the flames and that was used to ignite small tinder and wood shavings.

The Temperature? Good question. I don't know. Whatever the temperature is of a small spark.