Does the smoke look black?
Yes, the smoke is black.
    src        edge_attr  dst
0     1   to the left of    5
1     1   to the left of    8
2     1   to the left of   16
3     2   to the left of    9
4     3   to the left of   11
5     4   to the left of    9
6     4               on   14
7     4               on    8
8     5  to the right of    1
9     6   to the left of    8
10    7               on   14
11    7         climbing   14
12    8  to the right of    6
13    8  to the right of    1
14    9               on   14
15    9  to the right of    4
16    9  to the right of    2
17   11               in    9
18   11  to the right of    3
19   11  to the right of   13
20   11  to the right of   12
21   12   to the left of   11
22   12   to the left of   17
23   13               on   14
24   13   to the left of   17
25   13   to the left of   11
26   14               of    9
27   16  to the right of    1
28   16               in    9
29   17  to the right of   12
30   17  to the right of   13