THE CASE OF THE DISAPPEARING GLASS 155
Notice that we have not truly combined the two basic methods. Part
is bright eld and part is dark eld. Wherever the two methods remain
distinct, the glass is well dened. Only in the transition area do the two
methods mix. ere can be a noticeable loss there. However, keeping the
transition small can minimize this problem.
SOME FINISHING TOUCHES
Up to this point we have discussed techniques that dene the shape of glass-
ware. As you have seen, we can dene the subject shape by using either dark
lines against a light background or light lines against a dark background.
ese two techniques are the foundation for lighting glass. However, we
oen need additional techniques to produce a satisfacto ...