早前台灣有測試發現部分彩色口罩所用的染料含「偶氮色料」有機會釋出致癌物，令不少人擔心彩色口罩的防疫功效。香港口罩及防疫設備協會最近就彩色印花口罩進行含菌量測試，發現口罩顏色染料不會助長細菌滋生。
香港口罩及防疫設備協會委託CMA檢定中心與香港標準及檢定中心STC分別以白色醫療外科口罩面料(不織布)，粉紅色或藍色醫療外科口罩面料(不織布)，及印花醫療外科口罩面料(水刺布)進行含菌量測試，於各口罩樣本面料注入一定數量金黃葡萄球菌，分別閒置及捲晃6小時。
在測試6小時後，發現所有樣本的含菌量均下降，當中，印花口罩的水刺布含菌量降幅較淨色口罩更大，含菌量僅餘22個，白色及粉紅色口罩的含菌量分別為63和60個。檢測結果顯示，3款不同顏色的口罩均不會加強細菌的生長。而且在測試過程中，亦沒有發現細菌會由面料滲透至內層底料。
香港口罩及防疫設備協會委員郭浩賢表示，口罩佩戴一段時間後，環境的衛生程度、使用者雙手接觸口罩的次數、呼吸速度、說話及進食的次數等，都會影響口罩的含菌量，但只要過濾層(例如溶噴布或納米布)細菌過濾效率(BFE)超過99%，面料上的細菌基本上不可能穿越口罩進入佩戴者的呼吸道。
圖：unsplash、pexels
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