ABSTRACT

In the past, cattle blood was used for painting in central Europe mainly for interior wooden elements. Unfortunately, this common wood-coating technique of the past had vanished during the 20th century and only many misinformed opinions are left about this coating’s purpose and its effects on wood durability. Three different recipes were used for beech and pine sapwood treatment, which were tested for their durability against wood-rotting fungi and termites. The fire retardancy of blood-based paints and its color change during the hardening process was determined as well. Over the course of time the bright brick red color of the coating turns a dark brown color. The coating surface layer did not protect the wood against either white- or brown-rot fungus; it is rather a source of nutrients necessary for a fungi degradation activity. The specimen treatment with the blood-based paint did not avoid termites feeding on wood, however the overall mortality was reached at the end of the test. The higher pH of the treated wood and/or available amount of micronutrients could be plausible explanations. Although fire retardancy of the coating was not proved, flame-exposed spruce wood with the coating did not show significantly improved fire resistance compared to untreated wood.

摘要

过去，牛血在中欧主要用于室内木制元素的绘画。不幸的是，过去这种常见的木器涂料技术在20世纪消失了，关于该涂料的用途及其对木材耐久性的影响，人们只留下了很多误解。对山毛榉和松材边材的处理使用了三种不同的配方，并测试了它们对木材腐烂真菌和白蚁的耐久性。还确定了血液基涂料的阻燃性及其在硬化过程中的颜色变化。随着时间的流逝，涂层的亮砖红色变成深棕色。涂层表面层不能保护木材免受白腐或褐腐真菌侵害。它是真菌降解活动所必需的营养素来源。用基于血液的涂料进行标本处理不能避免白蚁以木材为食，但是在测试结束时达到了总死亡率。处理后的木材较高的pH值和/或可用的微量营养素含量可能是合理的解释。尽管没有证明涂层的阻燃性，但是与未处理的木材相比，带有涂层的火焰云杉木材的阻燃性没有显着提高。