Direct Blue 1

{{Chembox

| Verifiedfields = changed

| verifiedrevid = 450720938

| ImageFile = Pontamine sky blue.svg

| ImageSize = 300px

|IUPACName=tetrasodium (6E)-4-amino-6-[[4-[4-[{{prime|N}}-(8-amino-1-oxo-5,7-disulfonato-2-naphthylidene)hydrazino]-3-methoxy-phenyl]-2-methoxy-phenyl]hydrazono]-5-oxo-naphthalene-1,3-disulfonate

|OtherNames= Airedale Blue FFD,

Amanil Sky Blue 6B,

Amanil Sky Blue FF,

Atlantic Resin Fast Blue

|Section1= {{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 2610-05-1

| UNII_Ref = {{fdacite|changed|FDA}}

| UNII = 8NN34MAQ6H

| PubChem = 5359775

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 4514372

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/C34H28N6O16S4.4Na/c1-55-23-11-15(3-7-19(23)37-39-21-9-5-17-25(57(43,44)45)13-27(59(49,50)51)31(35)29(17)33(21)41)16-4-8-20(24(12-16)56-2)38-40-22-10-6-18-26(58(46,47)48)14-28(60(52,53)54)32(36)30(18)34(22)42;;;;/h3-14,37-38H,35-36H2,1-2H3,(H,43,44,45)(H,46,47,48)(H,49,50,51)(H,52,53,54);;;;/q;4*+1/p-4/b39-21-,40-22+;;;;

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = UPKAWFACSJWKND-ZXFFUEEESA-J

| SMILES=[Na+].[Na+].[Na+].[Na+].[O-]S(=O)(=O)c6c5\C=C/C(=N/Nc1ccc(cc1OC)c2ccc(c(OC)c2)N/N=C4\C=C/c3c(cc(c(N)c3C4=O)S([O-])(=O)=O)S([O-])(=O)=O)C(=O)c5c(N)c(c6)S([O-])(=O)=O

| MeSHName=

}}

|Section2= {{Chembox Properties

| Formula=C₃₄H₂₄N₆Na₄O₁₆S₄

| MolarMass =992.804

| Appearance= Amorphous, fine blue powder.

| Density=

| MeltingPt =

| BoilingPt =

}}

|Section3= {{Chembox Hazards

| MainHazards = Xn[http://www.chemicalbook.com/ChemicalProductProperty_EN_CB2136938.htm Dye at "Chemical Book"]

| FlashPt=

}}

}}

Direct Blue 1 is an organic compound that is one of many azo dyes. This salt is used as a substantive dye for textiles with high contents of cellulose, i.e. cotton. It is prepared by the azo coupling of the aminonaphthalene and diazotized derivative of o-dianisidine.Klaus Hunger, Peter Mischke, Wolfgang Rieper, Roderich Raue, Klaus Kunde, Aloys Engel: "Azo Dyes" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim.{{doi|10.1002/14356007.a03_245}}.