The synthetic equipment in Diablo II is orange instead of dark gold. The synthetic formula of orange equipment can be found in the Dark Encyclopedia of Cape Kane. The synthesis conditions of orange equipment are: A magic equipment (blue items), including gloves, necklaces, rings and belts; the rest items cannot be used for synthesis+blue jewelry (non-gemstones)+specified runes (reference formula)+perfect gemstones (color reference formula); the formulas of other items have fixed attributes, and additional attributes will be generated according to your role level and the attachments of the synthesized items. With luck, items that can be synthesized may be better than hidden gold equipment attributes.