Carbon Content Sheet Preparation: Low carbon steel foil with carbon content below 0.1%, thickness less than 0.003" or below 0.1mm, length approximately 100mm, width around 10mm, weight over 1g, free from rust, discoloration, and minor burrs. Carbon Content Sheet Cleaning: Clean with a cloth or paper towel and dry, ensuring surface debris is thoroughly wiped away. Weighing: After cleaning, the carbon content sheet must not be contaminated before weighing. Use a balance or electronic scale with a resolution of 0.1mg to measure the weight before carbon determination.