Modifiers matching ink:

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

Simple categories matching invisible:

• process,
• entity,
• force,
• phenomenon,
• ideal,
• thing,
• diversity,
• agent,
• being,
• reality,
• material,
• property,
• level,
• cause,
• condition,
• character,
• fluid,
• substance,
• quality,
• object,
• attribute,
• ray,
• symbol,
• difference,
• disease,
• variable,
• range,
• nature,
• creature,
• trade,
• image,
• elements,
• course,
• power,
• wave,
• state,
• matter,
• trait,
• ink,
• adhesive,
• structure,
• organism,
• particle,
• defect,
• germ,
• difficulty,
• symptom,
• import,
• quantity,
• vision,
• gas,
• light,
• disability,
• substructure,
• objective,
• microorganism,
• energy,
• microbe,
• radiation,
• item,
• offense,
• contaminant,
• illness,