Universally, it is associated with eternity and serenity, probably because of associations with a blue sky. Purple in western culture is the color of royalty. Other colors also function symbolically, and these may carry different symbolism. Be sure if you identify the symbolism of a color beyond what's offered here that you give evidence in support of your opinion. Ink can be more intense than pencil or chalk, etc.
Vertical lines are unstable and suggest poise and aspiration.
Soaring diagonals can suggest effort or release from difficulty. Plunging diagonals can suggest falling or loss of control or speed. Chaotic or unorganized lines can suggest disorder, chaos, frantic feelings. Circular lines can suggest safety, contentment, serenity. D. Types of Line controlled line is continuous and even in thickness, resulting in a feeling of order, perhaps rigidity spontaneous line is broken and uneven in thickness, resulting in feelings of playfulness and activity, suggesting something still in process.