https://www.nodc.noaa.gov/archive/arc0146/0204244/
Index of /archive/arc0146/0204244
index ofarchive
https://pubchem.ncbi.nlm.nih.gov/patent/EP-0204244-A3
Tetrakis azo dyes - Patent EP-0204244-A3 - PubChem
EP-0204244-A3 chemical patent summary.
azo dyespatenteppubchem