Browsing by Subject "lupiini"

Obtaining blue colours from nature has been found to be difficult. The aim of this re-search was to find out the blue colour provided by the three natural dyes as well as the effect of the dyeing method on the blue colour, colour fastness, and the repeatability of the colour following a certain dyeing method. The research began with dyeing methods found on social media, which had been used to create a blue colour from certain natural dyes. As stated by several home dyers, the colour given by blue colours from nature and certain natural dyes could be observed to be formed as a result of chance. The colour fastness of many materials dyed blue is found to be weak, due to flavonoid com-binations contained in the dyes. In this experimental research which blue colour was sought from preselected natural dyes: frozen lupine, black beans and frozen alder buckthorn berries. In the research, two mixed yarn samples with a single natural dye, a total of six samples, were dyed for the actual experiments. For pre-tests, several mixed yarn samples were dyed to find the blue colour. All the mixed yarn samples were pre dissolved with alum and some of them used tartar as an auxiliary. In dyeing vinegar was used to change the pH of some dye broths to a more acidic one. The pH values of all dye broths were tested by meas-uring. The dyeing temperatures were standardized in pre-tests using a digital meter, in actual tests the correct temperature was adjusted to the Linitest device. Colours of the dyed samples was determined by the CIELab device and total colour difference of two samples dyed with the same natural dye was investigated. The dyed samples were subjected to standard tests of color fastness: abrasion resistance test, water wash re-sistance test and light resistance test. Colour fastness tests were only done on the first dyed samples of the actual test, pre-tests colour fastness was not testing. The results of the research were examined quantitatively and qualitatively. It was possible to repeat the blue colour using a certain dyeing method. The pH value and dyeing temperature of the dye broth contributed to the adhesion of the colour to the yarn. All the dyed samples had low to moderate colour resistance. The abrasion re-sistance in almost all samples was good. In the wash resistance test staining was mini-mal, but the washed samples changed colour or the colour was disappeared almost completely. Light fastness in all samples war weak.