Pliiatsikõvadus
Pliiatsikõvadus refers to the hardness of a pencil lead, a characteristic that determines the darkness and thickness of the line it produces. This hardness is standardized using a scale that ranges from very soft (B, BB, BBB) to very hard (H, HH, HHH). The 'B' designation stands for blackness, indicating a softer lead that deposits more graphite onto the paper, resulting in darker and thicker lines. The 'H' designation stands for hardness, indicating a harder lead that deposits less graphite, creating lighter and thinner lines.
The scale also includes 'HB' and 'F' grades, which represent intermediate levels of hardness. HB is a