The Comparison of Colour Coefficient from Plant-Extracted Colour on Different Types of Paper for Painting

Abstract

The objective of this study was to compare the values of colours extracted from plants with
different solvents and the fastness of colours on five different types of painting papers. The three-colour
groups from different kinds of plants are including Yellow: Gardenia jasminoides J.Ellis (fruits), Coscinium
fenestratum (Goetgh) Colebr (climbers), Nelumbo nucifera Gaertn (pollen); Red: Smilax corbularia Kunth
(rootstocks), Caesalpinia sappan L. (heartwood), Bixa orellana L. (seeds), and Blue: Fresh Strobilanthes
cusia (Nees) Kuntze (fresh leafs and branches), Clitoria ternatea L. (flowers), Fermented Strobilanthes
cusia (Nees) Kuntze. Plants were extracted by ethanol and water as solvents in a ratio of 1:5 (plant:
solvent). The materials were dipped into resulting colours and compared for fastness using colourimeters
to determine the values of L*a*b* or CIELAB. The results revealed that Coscinium fenestratum (Goetgh)
Colebr in ethanol and water provides the highest luminance - L* and Gardenia jasminoides J.Ellis in
ethanol provides the highest b* value in yellow group. In red group, Smilax corbularia Kunth in ethanol
provides the highest luminance - L* and Bixa orellana L. in ethanol provides the highest a* value. In
blue group, Fresh Strobilanthes cusia (Nees) Kuntze in ethanol and water provides the highest luminance
- L* and Clitoria ternatea L. in water provides the highest -b* value which is higher than in ethanol. With
water, Fresh Strobilanthes cusia (Nees) Kuntze produced highest luminance - L*. After the comparison of
colour value, it is found that these 3 following plants provide the different highest colour value on 300
gsm Cotton 100% paper. Gardenia jasminoides J.Ellis in ethanol provides the highest b* value at 81.73
in yellow group. Bixa orellana L. in ethanol provides the highest b* value at 47.30 in red group. Clitoria
ternatea L. in water provides the highest -b* value at -18.65 in blue group.