Modifiers matching ink:

• coloured,
• viscous,
• color,
• prepared,
• organic,
• clear,
• solid,
• fluid,
• simple,
• friendly,
• magical,
• visible,
• greasy,
• colored,
• corrosive,
• aqueous,
• invisible,
• opaque,
• expensive,
• dark,

Simple categories matching opaque:

• material,
• gem,
• object,
• tissue,
• obstruction,
• mineral,
• component,
• liquid,
• stone,
• imperfection,
• gemstone,
• surface,
• glass,
• bag,
• solid,
• paper,
• fence,
• fluid,
• film,
• substrate,
• sack,
• foodstuff,
• ingredient,
• coating,
• matter,
• mark,
• assembly,
• container,
• part,
• substance,
• fiber,
• ink,
• matrix,
• filler,
• paint,
• document,
• oxide,
• symbol,
• language,
• creature,
• beverage,
• copy,
• obstacle,
• layer,
• medium,
• conductor,
• pigment,
• image,
• metal,
• product,
• web,
• item,
• picture,
• particle,
• structure,
• rock,
• sheet,
• body,
• plastic,
• fabric,
• cell,
• adhesive,
• contaminant,
• article,
• barrier,
• sunscreen,
• original,
• powder,
• system,
• aggregate,
• content,