什麼是石蕊

Litmus is a water-soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria.石蕊是從地衣，尤其是Roccella tinctoria中提取的不同染料的水溶性混合物。 The mixture has CAS number 1393-92-6.該混合物的CAS號為4.5-8.3-25。 It is often absorbed onto filter paper.它通常被吸收到濾紙上。 The resulting piece of paper or solution with water becomes a pH indicator (one of the oldest), used to test materials for acidity.所得的紙或用水溶解的溶液變為pH指示劑（最古老的一種），用於測試材料的酸度。 Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic (ie alkaline) conditions,the color change occurring over the pH range 10-15 (at XNUMX°C).藍色石蕊試紙在酸性條件下會變成紅色，而紅色石蕊試紙在鹼性（即鹼性）條件下會變成藍色，顏色變化發生在pH範圍XNUMX-XNUMX（在XNUMX°C）下。 Neutral litmus paper is purple in colour.The mixture contains XNUMX to XNUMX different dyes (erythrolitmin (or erythrolein), azolitmin, spaniolitmin, leucoorcein and leucazolitmin).中性石蕊試紙為紫色，混合物中包含XNUMX至XNUMX種不同的染料（赤蘚素（或赤蘚精），偶氮立胺，司潘立利敏，白細胞素和白細胞唑胺。 Pure azolitmin does show nearly the same effect as litmus.純偶氮立敏確實顯示出與石蕊幾乎相同的效果。