中文名称：钙指示剂/钙羧酸指示剂/钙红/钙羧酸钠/钙羧酸/钙试剂羧酸钠/3-羟基-4-[(2-羟基-4-磺基-1-萘基)偶氮]-2-萘羧酸/2-羟基-1-(2-羟基-4-磺基-1-萘基偶氮)-3-萘甲酸/钙试剂羧酸/3-羟基-4-(2-羟基-4-磺基-1-萘基偶氮)萘-2-羧酸/1-(2-羟基-4-磺基-1-萘基偶氮)-2-羟基-3-萘甲酸/Calconcarboxylic acid
中文别名：钙试剂羧酸钠;2-羟基-1-(2-羟基-4-磺基-1-萘基偶氮)-3-萘甲酸;钙羧酸;钙羧酸指示剂;2-羟基-1-(2-羟基-4-磺基-1-萘基偶氮)-3-萘甲酸(1:100用硫酸钾稀释);Calconcarboxylic acid 钙羧酸;钙红;钙羧酸 IND;钙羧酸溶液;钙羧酸指示剂, 指示剂;钙羧酸指示剂,AR;钙羧酸指示剂,ind;钙指示剂;硫酸钾稀释NN;1-(2-羟基-4-磺基-1-萘基偶氮)-2-羟基-3-萘甲酸;1-(2-羟基-4-磺基-1-萘基偶氮)-2-羟基-3-萘甲酸,钙指示剂;1-(2-羟基-4-磺基-1-萘偶氮)-2-羟基-3-萘甲酸;3-羟基-4-(2-羟基-4-磺基-1-萘基偶氮)萘-2-羧酸;3-羟基-4-[(2-羟基-4-磺基-1-萘基)偶氮]-2-萘羧酸;分析纯AR;钙红,钙指示剂,钙羧酸,3-羟基-4-[(2-羟基-4-磺基-1-萘基)偶氮]-2-萘羧酸, 2-羟基-1-(2-羟基-4-磺基-1-萘基偶氮)-3-萘甲酸;钙试剂羧酸;钙羧酸,钙羧酸指示剂,钙红;钙羧酸批示剂;钙羧酸指示剂 优等品;钙羧酸指示剂,Calconcarboxylic acid,AR;钙羧酸指示剂,Calconcarboxylic acid,IND;1-(2-羟基-4-磺基-1-萘偶氮)-2-羟基-3-萘甲酸 (1:100用硫酸钾稀释);3-羟基-4-[(2-羟基-4-磺基-1-萘基)偶氮]-2-萘羧酸 (1:100用硫酸钾稀释);钙指示剂 (1:100用硫酸钾稀释);钙红指示剂 (1:100用硫酸钾稀释);钙试剂羧酸 (1:100用硫酸钾稀释)
英文别名：3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid;Calconcarboxylic acid;2-hydroxy-1(2-hydroxy-4-sulfo-1-*naphthylazo)3-na;2,2-dihydroxy-4-sulpho-1,1-azonaphthalene-3-carboxylic acid;3-Hydroxy-4-(2-hydroxy-4-sulpho-1-naphthylazo)-2-naphthalenecarboxylic acid~Patton ａnd Reeders;2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid (1:100 diluted with K2SO4);3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylicacid,indicatorgrade,pure10GR;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylicacid,indicatorgrade,pure250GR;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylicacid,indicatorgrade,pure50GR;3-HYDROXY-4(2-HYDROXY-4-SULFO-1-NAPHTYLAZO)NAPHTHALENE-2-CARBOXYLIC ACID, INDICATOR;NN diluted with Potassium Sulfate;1-(2-Hydroxy-4-sulfo-1-naphthylazo)-2-hydroxy-3-naphthoic acid;2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid;3-hydroxy-4(2-hydroxy-4-sulfo-1-naphthyl-azo)-2-naphthalenecarboxylic acid;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naph;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid, pure, indicator grade;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid,indicator grade;3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]naphthalene-2-carboxylic acid;Calcon-carboxylic Acid;CalconCarboxylicAcidGr;CAL-RED(R);HHSNN;IND;Indicator;Patton ａnd Reeder Dye;Calcon-carboxylic Acid (1:100 diluted with K2SO4);Cal Red (1:100 diluted with K2SO4);Patton-Reeder indicator;Calconcarbonic acid;Calcon 3-carboxylic acid;Patton ａnd Reeder＇s indicator;2-Naphthalenecarboxylic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-;NN;2,2＇-Dihydroxy-4＇-sulpho-1,1＇-azonaphthalene-3-carboxylic acid;2-Hydroxy-1-(2-hydroxy-4-sulfo-1-napthylazo)-3-naphthoic acid;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic ac;NSC-97307;Cal Red;3-Hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)diazenyl]-2-naphthoic acid #;NS00045853;AKOS024285057;2-Naphthalenecarboxylic acid, 3-hydroxy-4-(2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl)-;Calcon-3-carboxylic acid;3-hydroxy-4-[(2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl]naphthalene-2-carboxylic acid;3-Hydroxy-4-((2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl)-2-naphthoic acid;Kalces; NN; NSC 97307; Patton ａnd Reeder＇s indicator;Patton-reeders reagent (Calconcarboxylic acid) indicator;3-Hydroxy-4-[2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl]-2-naphthalenecarboxylic acid;2-Naphthalenecarboxylic acid, 3-hydroxy-4-[2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl]-;Q570828;Patton ａnd Reeder＇s reagent;2-Hydroxy-1-(2-hydroxy-4-sulpho-1-naphthylazo)-3-naphthoic acid;Calconcarbonsaure;BDBM50105956;NN, CP;SMP1_000051;3737-95-9;3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)-2-naphthalenecarboxylic acid;EINECS 223-117-0;2-Naphthalenecarboxylic acid,3-hydroxy-4-[(2-hydroxy-4-sulfo-...
CAS号：3737-95-9
分子式：C21H14N2O7S
分子量：438.41
密度：1.6000
沸点：°Cat760mmHg
水溶性：微溶
纯度：IND

在化学试剂中，把带有颜色或可改变颜色的一类试剂统称为色素试剂，它包括了指示剂、显色剂和染色剂。

酸碱指示剂是遇到酸、碱能改变试剂颜色的指示剂，主要用来指示溶液的 PH 值，指示酸碱滴定的终点，如：甲基橙、酚酞、甲基红等。这些酸碱指示剂也是一种染料，但一般染料并不能直接作为酸碱指示剂，一般要进行提纯，严格控制试剂中的杂质含量，否则可造成 PH 值变色范围的迁移，影响滴定分析的结果。

氧化还原指示剂是指遇到氧化剂或还原剂能改变颜色的试剂，主要指示溶液中的氧化剂或还原剂的存在、用于指示氧化还原滴定分析的终点，如二苯胺、二苯胺磺酸钠、次甲基蓝、邻二氮非 - 亚铁等。

能指示络合滴定终点的指示剂称为络合指示剂，因络合剂与金属离子之间的反应，所以络合指示剂一般均为金属离子的显色剂，如二甲酚橙、铬黑 T 、 PAN 、 PAR 、酸性铬兰 K 等。

在显色剂中还有很多是门为光度分析用的金属离子显色剂如铜试剂、双硫腙、钒试剂、铝试剂等。这类试剂要求含量较高，欲测的金属离子和有干扰的离子要求含量较低，否则就会造成空白值低，吸光度误差大，测定值不准确等。

色素中还有一种试剂称为生物染色剂，他是用于生物体的染色和结缔组织、细菌草软毛、昆虫活体、细胞壁、细胞核的染色。如次甲基兰、酸性品红、碱性品红、中性红、考马斯亮兰等，这些试剂有的需直接合成，有的可从工业染料中提纯制备。如次甲基兰，染料次甲基兰中含有大量锌盐，必须洗掉锌盐才可作为生物染色剂。

值得一提的是工业染料的名字与染色剂的名字有很大的差异，千万不要混淆。如染色剂的酸性品红和染料的酸性品红的结构式分别为：酸性品红（生物染色剂）  酸性品红（染料）