Keywords: refractive index
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Journal Articles
Surface Innovations 1–14.
Published: 05 October 2026
.... In addition, the oil viscosity decreased from 60.29 to 38.60 cSt, and the refractive index from 1.70 to 1.46, indicating an improvement in the oil’s clarity and physical quality. Thus, the acid-activated MMT from Marapi volcanic ash shows potential as an effective adsorbent in refining palm oil...

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