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The color fastness of ultraviolet (UV) ink on outdoor print media is a crucial aspect that affects long-term visual quality. This study aims to evaluate the effect of varying the duration of UV exposure on the color stability of UV magenta ink applied to flexi-based banner media. The testing process was carried out experimentally through artificial irradiation, with color change analysis using the CIE Lab color system and the ΔE parameter as an indicator of degradation. The results showed that the longer the irradiation duration, the higher the ΔE value produced, which indicated significant color degradation. This finding emphasizes the importance of applying additional protection, such as UV lamination coating, to improve the color fastness of prints for outdoor use.

This study aims to evaluate the lightfastness of organic ink formulated from purple sweet potato (Ipomoea batatas L.) pigment for screen-printing applications on 24s cotton combed fabric. The ink formulations varied the pigment amount (10, 15, and 20 grams) and solvent volume (distilled water) of 25 and 30 mL, while the binder and thickener components were kept constant. Lightfastness was assessed by measuring the change in lightness (ΔL*) before and after 24 hours of light exposure. The results showed that the formulation containing 15 g of pigment and 25 mL of solvent (P2A1) exhibited the best colorfastness, with an average ΔL* of 0.23, while the formulation with 10 g pigment and 25 mL solvent (P1A1) showed the poorest performance (average ΔL* of 1.86). A lower solvent volume resulted in higher resistance to light exposure. Moreover, using either too little or too much pigment negatively affected ink transfer and reduced lightfastness. Two-way ANOVA on log-transformed data revealed that the interaction between pigment concentration and solvent volume had a significant effect on ΔL* (p < 0.001), contributing 72.8% to the total data variation. This study confirms that achieving an optimal balance between pigment amount and solvent volume is crucial for producing organic ink with good lightfastness

Color fastness in Direct to Film (DTF) digital screen printing is influenced by various external factors, one of which is exposure to ultraviolet (UV) light. This study aims to evaluate the impact of UV light on the color stability of DTF prints on two types of fabric, namely 30s cotton and spandex rayon. A quantitative approach was used in this study, involving color difference testing (ΔE), washing simulations, and UV exposure. Based on the analysis results, cotton 30s demonstrated superior color fastness performance compared to spandex rayon, as indicated by lower ΔE values after UV exposure and washing processes. Conversely, spandex rayon experienced more drastic color changes, especially after being washed with bleach detergent. These findings emphasize that the selection of fabric materials and washing methods are critical factors.

This study aims to analyze the effect of work involvement, organizational culture, and cohesiveness on the performance of agricultural extension workers at the Department of Agriculture and Food Security of Yogyakarta Special Region. The approach used is quantitative, the population is 263 civil servant extension workers and the sample is determined as many as 154 respondents. the sampling technique used is proportional random sampling. Data analysis was carried out with the Partial Least Square (PLS) approach using the SmartPLS 4.0 application. The results showed that work involvement and organizational culture had a positive and significant effect on the performance of extension workers. In addition, cohesiveness was shown to partially mediate the effect of work engagement on extension worker performance, which indicates that cooperation and solidarity between teams play an important role in strengthening the impact of individual engagement on performance. Finally, cohesiveness mediates the effect of organizational culture on the performance of agricultural extension workers. This study concludes that improving the performance of agricultural extension workers requires a comprehensive strategy, not only through increasing individual engagement, but also through strengthening the work culture and cohesiveness of a supportive team.  

The study explores the application of bioethical aspects in the use of botanical pesticides for pest prevention in the environment at the Horticultural Seed Development Unit (UPT) under the Department of Agriculture and Fisheries. Utilizing a qualitative approach with quantitative elements, this research aims to deepen understanding regarding bioethical practices in botanical pesticide usage and evaluate its effectiveness in controlling pests. The population consists of employees and students involved in pesticide-related activities, selected through purposive sampling to ensure knowledgeable respondents. Key variables include the independent variable of botanical pesticide application and dependent variables such as pest population reduction, environmental impact, and the presence of beneficial non-target organisms like pollinators. The descriptive qualitative method combined with survey techniques provides insights into how bioethical principles are integrated into pest control strategies, promoting sustainable agricultural practices. This research contributes to advancing environmentally friendly pest management solutions while maintaining ecological balance.