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CONCRETE TECHNOLOGYwww.cpi-worldwide.com CPI %u2013 Concrete Plant International %u2013 1 | 2026 77parameters such as moisture, temperature, airflow, or residence time in the dryer. Slight changes in these parameters lead to lighter or darker grains. Because Oxerra originally developed the Granufin granule, these effects have been known for decades, and each batch is specifically tested for the parameters that are decisive for the actual concrete color.Granufin Red 208G: Strong color, same experienceEven with strong colors like Granufin Red 208G, the picture repeats itself: visibly different on the outside of the granule %u2013 hardly distinguishable in the concrete.What does this mean for daily operations? For concrete plants, the most important insight is simple: The shell may vary. The pigment does not, and it will not. Therefore, anyone discovering an unusually light or dark batch in a Big Bag should not prematurely doubt the pigment quality. The decisive factor is the coloration (color development), and this lies within the known specifications. Tip from OxerraIn case of uncertainty, a brief consultation with the application engineers or a quick lab test often provides certainty. In the vast majority of cases, it will be confirmed: The concrete is perfect %u2013 even if the granules look different. nFig. 5: The lab specimen confirm the result even under practical conditions. FURTHER INFORMATIONOxerra Deutschland GmbH & Co. KGM%u00fchlstra%u00dfe 118, 65396 Walluf, GermanyT +49 61237970europe.oxerra.comCustomer sample 1Standard sampleCustomer sample 2