Topic
Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: In this paper, it was observed that when atmospheric oxygen acts as the oxidant, only catechols respond to the test and this allowed the determination of Catechols in the presence of other phenols.
25 citations
Patent•
10 Sep 2003
TL;DR: In this paper, a thermochromic color memorizing composition consisting of an electron donative colorable organic compound, an electron acceptive compound and a homogeneous phase solution of esters represented by general formula is presented.
Abstract: PROBLEM TO BE SOLVED: To provide a thermochromic material, in which color memorizing effects are revealed by selecting the reaction medium of a color reaction through the giving and receiving reaction of electrons to a specified compound, the new reaction medium is found out and the degree of freedom in selection is enlarged. SOLUTION: This thermochromic color memorizing composition comprises (A) an electron donative colorable organic compound, (B) an electron acceptive compound and (C) a homogeneous phase solution of esters represented by general formula (1) as a reaction medium for controlling the color reaction between (A) and (B), wherein R represents at least a 4C alkyl group or alkenyl group and also a thermochromic color memorizing microcapsule pigment containing the thermochromic color memorizing composition is dealt. COPYRIGHT: (C)2005,JPO&NCIPI
25 citations
TL;DR: The heterocyclic nucleus in tryptophan is oxidised byNitrous acid at elevated temperature to produce a phenolic intermediate which further reacts with nitrous acid to form a nitro compound that has a golden yellow colour in alkaline medium.
25 citations
TL;DR: In this article, a highly selective colorimetric method for vanadium V, based on its colour reaction with Xylenol Orange, is described, in the presence of 1,2-diaminocyclohexanetetra-acetic acid (DCTA).
24 citations
Patent•
29 Jun 1973TL;DR: An improved reagent system for determining calcium by the orthocresolphthalein complexone color reaction is described in this article, which utilizes an alkaline buffer containing an aminoloweralkanol providing a pH of about 10.2 - 10.5.
Abstract: An improved reagent system for determining calcium by the orthocresolphthalein complexone color reaction. The reagent utilizes an alkaline buffer containing an aminoloweralkanol providing a pH of about 10.2 - 10.5. A method for using the reagent is also described. The composition is stable for extended periods.
24 citations