Be sure to test pen on a spare piece of fabric before using, making sure marks remove to your satisfaction. Do not iron over marks before removing; because it will permanently set marks on some fabrics. On rare occasions, certain dyes in materials (dyes containing red in particular) may make removing marks difficult. Replace cap when not in use to prevent drying out.
NOTE: Be sure marks are completely removed with plain water before laundering. Some laundry products containing more than 3% sodium hydroxide or more than 5% sodium carbonate may cause the marks to turn a brownish color if they are not removed before laundering.