生漆的品质及其检验技术

生漆是一种天然涂料,其品质与产地、漆树品种、立地条件、采割时间、采割技术和贮存时间等有关。一般生漆中约含有漆酚40~80%,树胶质和含氮物6~14%,水分14~40%。生漆中各组成成分的变化,造成了生漆品质的差异。生漆检验主要依据其表观特征以及各组分的含量差异,通过看漆质、闻气味、煎分数、试燥性、测含量判定品质之优劣。一般而言,生漆乳液分层愈明显,转色愈快,漆酚含量愈高,生漆品质愈佳。掺有异物的生漆具异象,漆酚含量通常较低。

Chinese lacquer's quality and testing

Sap is a natural paint and its quality has something to do with varieties, weather condition, tapping technology and storing time. Urushiol 40-80%, gum (resin) and nitrogen 6-14%, water 14-40%.The differences of sap quality are caused by changes of compositions. Sap is tested According to the differences of sap compositions. Whether it is good or not by looking, smelling, boiling, and we can know it's drying and content. Generally, the quicker sap layers and colour changes, the better urushiol is. The content of urushiol is lower if some other things are put in it.