Metal nanoparticles possess unique properties that they do not exhibit in their bulk states. One of these properties is the color due to surface plasmon resonance. Gold nanoparticles appear red. This color has been utilized in glass for a long long time. In recent years, highly concentrated pastes of gold and silver nanoparticles have been successfully produced by using a special type of protective polymer and a mild reductant. The paste of gold nanoparticles can be used for paint and other materials as red colorants.rnIn this article,application examples of gold nanoparticles as colorant are introduced.rnRecently, methods for producing bimetal nanoparticles such as gold/silver and gold/copper have been developed. These nanoparticles allow colors from yellow to green to be created. These methods and colors they produce are also described in this article.%ナノテクノロジーやナノマテリアルといった“ナノ”を冠rnする技術が最近，注目を集めているが，ナノサイズの金属粒rn子すなわち金属ナノ粒子もこのナノテクノロジーの一分野でrnあろう．特に，金属ナノ粒子が安定に分散したインクをインrnクジェット法でパターンを描画し，比較的低温度での加熱，rn焼成により電気伝導性を発現させて回路配線パターンを形成rnする研究がさかんに行われている．
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