Answer:
If you meant that the linen got burnt - you cant remove it - except with scissors:) If its burnt metal dust that has stained and you dont want to pay a professional cleaner, try these techniques. 1. Take the pants outside, use good soap to lather up the stain and spray the stain from both sides with a garden hose on full-blast 'jet stream' - for as long as it takes, repeating as needed. 2. Lather up the stain, lay a thin piece of wet cloth over the stained area and use an ultrasonic toothbrush on it, being careful not to let the bristles 'eat' through the covering cloth.