Structural Evolution of Burmese Amber during Petrifaction Based on a Comparison of the Spectral Characteristics of Amber, Copal, and Rosin

Table 3

Solubilities of amber, copal, and rosin samples in organic solvents.

Organic solvent
Sample	Ethanol	Acetone	Dichloromethane	1,4-Dioxane	Ethylacetate	N,N-Dimethylamide (DMF)
Burmese amber	IN	IN	IN	IN	IN	IN
Copal	PD	PD	DI	PD	PD	PD
Rosin	CD	CD	CD	CD	CD	CD

IN = insoluble; DI = dissolved; PD = partially dissolved; CD = completely dissolved.