▎ 摘　　要

NOVELTY - Ink composition comprises 15-25 pts. wt. sodium alginate, 10-12 pts. wt. propylene glycol methyl ether, 8-12 pts. wt. metal powder, 3-6 pts. wt. three-dimensional graphene, 3-5 pts. wt. mercaptan, 2-3 pts. wt. ammonium polyphosphate, 2-3 pts. wt. urea, 1.5-2 pts. wt. 2-heptadecylimidazole and 1.3-1.8 pts. wt. citric acid. USE - Ink composition (claimed). ADVANTAGE - The ink composition can be prepared in an environmentally-friendly manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing ink composition by mixing sodium alginate, propylene glycol methyl ether, metal powder, three-dimensional graphene, mercaptan, ammonium polyphosphate, urea, 2-heptadecylimidazole and citric acid, stirring the mixture and then deaerating under vacuum conditions, crushing the mixture using a ball mill for 5-15 minutes, and homogenizing the powder for 20-30 minutes at high-pressure.