• Preserve the long slim mauve-rose cylindrical pen and matching cap
• Engineer a dual-edge felt tip with fine-line and broad-fill functionality
• Control ink flow to prevent dry-out, flooding, and uneven staining
• Develop an 11-shade direction spanning baby pink through deep brown
• Select an airtight cap system and specify tip-down storage compatibility
• Evaluate transfer, feathering, stain longevity, tip durability, and fill-volume consistency
• Verify lip-use pigments, flavor/fragrance, claim language, and local labeling requirements