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Effect of Dehydration and Discoloration Time of Ethanol, Temperature, and Dipping Time of a Preservation Solution for Dyeing on Quality of Preserved Flowers of Rose ‘Pink Aurora’

The objective of this study was to examine the proper temperature and time for treatment when using ethanol for dehydration and discoloration of Rosa hybrida ‘Pink Aurora’ bred in Korea and also for treatment of a preservation solution for dyeing to make preserved flowers of this species. For dehydration and decolorization, dipping was carried out at 25 ± 2°C for 3, 6, 12, 18, or 24 hours, and dyeing was treated at 25, 30, or 35 ° C for 6, 12, 18, or 24 hours. The most effective duration of dehydration was 12 hours, considering that the red color decolored perfectly in the H value of the Munsell value, and the yellow color grew richer as the treatment time increased. For the treatment of the preservation solution, a “C” value (indicating chroma) was higher at 35℃ in 48 hours. Flower shrinking percentage was lower at lower temperatures and with longer times of immersion. The weight was reduced by 53%–47% after longer times of immersion at all temperatures (24-hour dehydration), whereas it was reduced by 73% after 6 hours of immersion and by 68% after 24 hours of immersion at 25°C (48-hour dehydration). In conclusion, longer immersion time resulted in lesser reduction of flower weight. In consideration of the above results, the most effective condition was dehydration for 12 hours and dyeing at 25°C for 24 hours.