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Historické nátěry z hovězí krve – změna barvy v průběhu vytvrzování a vliv způsobu opracování povrchu na jeho výslednou drsnost
 Hynek, Dominik
In this work we have been comparing the roughness of hand-worked and machined surfaces of spruce wood (Picea abies (L.) Karst.). We have also observed the change of the roughness of the surface after applying the paint based on the beef blood, and we have also compared the effect of two different ways of machining the surface on its final roughness. Last but not least we have also observed the change of the colour of the coat of paint based on beef blood during hardening. We based the assessment of the roughness of the surface on the difference of the parameters Ra and Rz measured by MITUTOYO SJ-201 P device. We gained the results of measuring the colour of the surface using the KONICA MINOLTA CM-2300d device, and the parameters are represented via the system CIEL *a*b*. We have not observed any statistically significant differences of the roughness of the hand worked and machined surfaces. The difference could only be observed after applying the paint based on beef blood on machined samples and other groups of samples. While measuring the colour changes during the process of hardening of the paint based on beef blood, we have observed statistically significant differences of parameters L*a*b*. The coat of paint was getting darker, less red and less yellow.
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4 Hynek, Daniel
4 Hynek, David
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