Table 10 Relation between wood color (L*, a*, b*) and precipitated smoke weight (y)

1.

Sengon

y = 79.952 − 1.069L* (**) − 0.870a* + 0.427b*

2.

Jabon

y = 99.779 − 0.633L* (**) + 1.714a* − 2.271b* (**)

3.

Mangium

y = 137.787 − 2.642L* (**) + 0.686a* + 0.747b*

4.

Pine

y = 180.924 − 2.357L* (*) + 1.413a* − 0.440b*

5.

All species

y = 111.537 − 1.520L* (**) + 2.152a* − 0.502b*