星号*：三种明暗/排线方法

正如上一课 所练习的，我们用铅笔尝试了三种不同的明度与明暗/排线表现方法。本幅画作由七年级学生完成：我们在正方形画纸上用美纹纸胶带贴出一个星号形状。贴胶带前，先将胶带轻轻按压在布料上（以降低其粘性），再贴到纸上——这样可避免揭除胶带时撕破纸面。接着，用软质铅笔绘制明暗关系，将画面中心区域涂画为最深的明度。这三种技法分别是：

1）晕染法：通过控制铅笔施加的压力变化来表现明暗

2）交叉排线法：以相反方向绘制斜向线条

3）揉擦法：叠加短小、随意、弯曲的笔触

完成明暗绘制后，我们揭去美纹纸胶带，并用广告颜料（树胶水彩）涂绘出留白的线条。

Asterisk* with three ways to shade

As in this previous lesson, we practiced three different ways to create value and shade with pencil. In this drawing, made with 7th grade students, we used artist tape on a square drawing sheet. We made an asterisk, being careful to stick the tape on any cloth before putting it on paper. In this way the tape becomes less adhesive and you avoid to tear the paper. With a soft pencil we drew the value, drawing the darkest part in the middle of the square. The three techniques are:

1) Blending: with different pressure of the pencil

2. Cross-hatching:  diagonal lines in opposite directions

3. Scumbling:  short, random curvy marks overlapped

After drawing the value we removed the artist tape and we painted the white lines with gouache.