*4.1. Participants*

The eighteen participants from the implicit association test also took part in the evaluations. The participants' age ranged from 22 to 35 years, with an average of 24.7 years (standard deviation of 2.9). Of the eighteen participants recruited, eight are female (44%), and ten are men (56%). All of the participants had previous experience with accessible visual artworks and expressed interest in the visual arts. None of the participants took part in the formative study. All the participants or their legal guardians gave signed informed consent. The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Institutional Review Board of Sungkyunkwan University (protocol code: 2020-11-005-001, 22 February 2021).

### *4.2. Multi-Sensory Color Code Effectiveness*

In this section, we investigate the effectiveness of our multi-sensory approach and a uni-sensory alternative color codes by comparing the color identification success rate achieved by the participants when using them. We performed this evaluation to determine if the proposed method improves the color identification success rate and explore its causes.
