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[궁금하면 찾아보는 커피백과사전] 도구편(3) 종이필터

핸드드립을 할 때 필요한 준비물에는 여러 가지가 있다. 드리퍼, 드립포트, 서버(계량컵), 드립필터, 온도계, 저울 등이 있는데 그 중 드립필터는 종이필터와 융으로 구분된다. 종이필터는 여과지라고도 불리며 드리퍼의 종류와 필터 색상에 따라 구분되는데, 그 이유에 대해 알아보자.

드리퍼는 메리타, 칼리타, 고노, 하리오 이 네가지가 가장 대표적으로 알려져 있다. 메리타와 칼리타는 사다리꼴 모양이고 고노와 하리오는 원뿔 모양이다. 종이필터가 드리퍼에 완전 밀착되어야 커피추출이 원활하게 이루어지기 때문에 메리타와 칼리타는 사다리꼴형태의 필터를 사용하고 고노와 하리오는 원뿔형태의 필터를 사용해야 한다.

요즘 사용량이 증가하고 있는 웨이브 칼리타는 사다리꼴이나 원뿔 모양이 아니다. 그래서 전용필터를 사용해야 하는데 웨이브 필터는 다른 필터와는 달리 바구니형태이고 벽면이 주름이 있다. 그 이유는 드리퍼에는 리브가 없기 때문에 필터에 주름을 만들어 리브의 역할을 할 수 있도록 하기 위함이다.

종이필터는 황색과 백색 두 가지 색상이 있는데 결론을 먼저 말하자면 표백여부에 따라 구분한 것이다.

먼저 황색필터는 표백을 하지 않은 천연펄프 그대로의 상태이다. 친환경적이라는 장점을 지니고 있지만 잘못 보관 했을 시 눅눅해지고 종이냄새가 많이 난다는 단점이 있다. 그래서 필수적인 것은 아니지만 종이냄새를 줄이고 싶다면 전체적으로 먼저 적셔주는 린싱 작업을 해주는 것이 좋다.

백색필터는 천연펄프를 표백 한 제품인데 예전에는 화학약품을 이용하여 표백을 했기 때문에 좋지 않았지만 현재는 모두 산소표백으로 만들어진다.

표백은 섬유에 있는 색소를 분해하는 과정으로 산화표백(환원표백)이 있다. 방법은 염소계표백과 산소계표백으로 두 가지 인데 염소계표백은 산소 외에 염소가스도 발생하여 해로운 가스를 생성할 수 있는 반면 산소계표백은 과산화나트륨이 물을 만나 과산화수소로 바뀌며 많은 산소를 발생시키는 방법이다. 백색필터는 바로 이 산소계표백을 활용하고 있기 때문에 건강문제를 걱정하지 않아도 된다.

종이필터는 섬유질로 만들어져 있기 때문에 주변의 습기를 머금을 수 있어 색상에 상관없이 뜯어서 사용한 후에 남은 필터들은 통에 담아서 보관하는 것이 좋다.

같은 종이필터여도 사용하는 필터의 종류에 따라 추출되는 커피의 맛과 행도 달라지기 때문에 필터를 결정하는 것도 중요하기 때문에 개인의 취향에 맞는 필터를 신중히 선택하도록 하자.

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