definitely written with white chalk on blackboard.
Size: 5472px × 3648px
Photo credit: © Tanaporn Phothikhet / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: abuse, art, background, black, blackboard, blackboard., business, chalk, chalkboard, communication, drawing, drugs, education, frame, fundraising, hand, isolated, message, object, retro, school, social, study, summer, text, texture, tips, white, wood, wooden, work, written