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Technical Data Sheet Alizarin Red S

Compound Information
Product Name: Alizarin Red S
CAS No.: 130-22-3
Molecular Formula: C14H7NaO7S
Molecular Weight: 342.26
Revision Date: 2026-04-16
Analytical Information
Tests Specifications
Description Yellow to orange powder.
Grade For Microscopy
Solubility H2O: soluble1mg/mL
Dye content (Spectrophotometry, on dry basis) min. 70.00%
pH transition range (pH 4.3 - 6.3) Brilliant yellow to pink
pH transition range (pH 9.4 - 12.0) Brown orange to violet
Absorption, L max (pH 4.3) 418 - 424nm
Absorption, L max (pH 6.3) 514 - 520nm
Absorption, L max (pH 9.4) 445 - 451nm
Absorption, L max (pH 12.0) 554 - 558nm
Loss on drying,110°C 8.00% max.
1H NMR Pass test
13C NMR Pass test
IR Pass test
Disclaimer: This information relates only to the specific material designated and may not be valid for such material used in combination with anyother materials or in any other process. Such information is to be the best of the company's knowledge and believed accurate and reliable as of thedate indicated. However, no representation, warranty or guarantee of any kind, express or implied, is made as to its accuracy, reliability orcompleteness and we assume no responsibility for any loss, damage or expense, direct or consequential, arising out of use. It is the user'sresponsibility to satisfy himself as to the suitableness & completeness of such information for his own particular use.
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