Statistical analysis of the proportion of recycled edible oil in the quality of scented candles

This work aims to analyze whether the variation in the proportion of recycled oil to make scented candles affects their quality. Three batches of candles were made at ratios 60-40, 70-30, and 80-20% of recycled oil and soy wax, respectively. The evaluation consisted of 7 tests: visual inspection, burning times, candle puddle, flame height, sensory rating scale, combustion afterglow check, combustion smoke, and post-combustion. The statistical analysis was performed using the MANOVA model. The multivariate test indicates a significant difference between the results of the quality tests of each batch of candles and the proportion used to manufacture the candles. However, the proportion of oil does not affect physical qualities such as color intensity, texture, imperfections, and aroma intensity.