Food　allergy　has　been　a　serious　public　health　problem　around　the　world.　Its　prevention　relies　heavily　on　the　effective　avoidance　of　any　contaminated　food,　making　clear　and　accurate　detection　very　important.　LAMP　is　one　of　the　most　potent　methods　for　allergen　rapid　detection.　However,　its　current　colorimetric　readouts　usually　have　low　color　contrast　and　narrow　color　variation　range.　Thus,　here　we　proposed　a　strategy　based　on　color　evolution　to　enlarge　the　variation　range　as　well　as　the　contrast　to　improve　its　suitability　for　naked-eye　observation.　By　simply　blending　two　commonly　used　color　change　processes　during　amplification,　a　wider　color　variation　window,　and　a　near　contrast　color　change,　purple-to-green　with　a　hues　difference　of　10　were　obtained.　Three　important　allergens　(walnuts,　hazelnuts,　and　peanuts)　were　tested　with　a　comparable　sensitivity　towards　fluorescent　real-time　LAMP.　Its　feasibility　for　practical　use　has　also　been　studied.　This　simple　but　effective　strategy　provides　a　new　idea　for　the　colorimetric　detection　of　LAMP　amplicons　and　can　be　applied　to　various　fields.　©　2021　The　Author(s)