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It is generally difficult to decolorize dyes in water because of their complex structure.
Aly, Chemistry of Water Treatment, second ed, Bota Raton, 1998

Branched and Responsive Antimicrobial Polymers Based on Modified PVA for Functionalizing of Cellulose Fibres Yuanfeng Pan1,2,a, Huining Xiao*1,b and Catherine Beh1,c 1 Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada 2 Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004 China ayuanfengpan@yahoo.com.cn, bhxiao@unb.ca, ccbeh@unb.ca Keywords: Antimicrobial polymer; polyvinyl alcohol, cellulose fibres; temperature-responsivity; polymer modification.
Characterization. 1H-NMR spectra were recorded in D2O or DMSO-d6 using a Bruker 400MHz spectrometer operating at 300.13 MHz to reveal the structure of modified PVA or APVA copolymers.

Apart from that, another explanation of the colour difference of the oxide layer may be ascribed to the different crystal structures of oxide layer.
Albrektsson, Classification of osseointegrated implant surfaces: materials, chemistry and topography, Trends in Biotechnology 28 (2010) 198-206

Introduction Zinc oxide (ZnO) with wurtzite structure has a large direct band gap around 3.37 eV, and a large excitation binding energy (60 meV) at room temperature.
Wang, Materials chemistry and physics, vol. 97 (2006), p. 219-225

Sandwich structure aerofoil demonstrator Produced at the Centre for Additive Layer Manufacturing (CALM) using the electron beam chamber and Titanium (Ti-6Al-4V) powder. 2.4 Metal Injection Molding This technique involves the melting and pelletization of a mixture of titanium pre-alloyed spherical powder and a binder that are injected into a die, the binder removed chemically/ thermally, and finally the part is sintered.
Parts up to about one pound can be fabricated by this method with good mechanical properties provided the Chemistry (particularly oxygen) is controlled.

Ajayan, New insights into the structure and reduction of reduced graphite oxide, Nature chemistry. (2009) 1-6

RESULTS AND DISCUSSIONS FTIR spectrum of bamboo paper sludge For bamboo paper sludge the FTIR spectroscopy (Fig.2) provides informationon the chemical structure of the material.
Plant fiber chemistry.

The Effect of Fatty Acid on Phase Behaviors of Tween 80/bmimPF6/toluene Microemulsions Yongjun Zheng1a, Heng Gao1a,Wumanjiang Eli2 1 Department of Chemical & Environmental Engineering, Anyang Institute of Technology, Anyang, 455000, China. 2 Xinjiang Technology Institute of Physics and Chemistry, Chinese Academy of Science, Urumqi, 830011, China.
Microemulsion stability is strongly influenced by the amount and structure of the cosurfactant [11-15].

After etching, as shown in Figure 2(a), the lath martensitic structure was revealed in the bulk material, which is typical of maraging steel.
The mean hardness of the recast layer was found to be almost 90% higher than that of the bulk material, which was attributed primarily to the residual stresses induced during ED machining in addition to the altered chemistry of the layer due to contamination from the W-Cu electrode and the formation of carbides due to increased carbon content in the recast layer.

When this condition is satisfied, the isolated bubbles can no longer detach because capillarity forces now grip this surrounding structure to the cylindrical electrode.
Adamson: Physical chemistry of surface, 5th edition, John Wiley and Sons, Inc., Canada (1990).