underburned
1underburn — /ˈʌndəbɜn/ (say unduhbern) verb (t) (underburnt or underburned, underburning) to burn at less than the normal temperature, as clay, etc. {under + burn1} …
2brown powder — noun : a gunpowder made by the use of an underburned brown charcoal instead of black charcoal called also cocoa powder …
3grappier cement — ˈgrapēˌā noun Etymology: French grappier, from grappe cluster, bunch of grapes (from Old French grape hook, grape stalk, bunch of grapes, grape) + ier er more at grape : a cement made by grinding fine the lumps of underburned and overburned… …
4salmon brick — noun : an underburned brick * * * a soft, imperfectly fired brick having a reddish orange color …