1. Purchase channel: Try to choose regular shops, official authorized dealers or official websites to avoid buying pencils of unknown origin.

2. Appearance quality: Observe the appearance quality of the pencil to see if there are obvious defects, color difference, bubbles, scratches and other problems.

3. Packaging and marking: Check whether the pencil is beautifully packaged, clearly printed, misspelled and ambiguous. Pay attention to whether the signs, trademarks and colors are consistent with the official description.