Canada balsam: a viscous yellowish transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.

According to experts speculate that general cement plastic rockery stone life in about 30 years, GRC plastic rockery stone life about 15 years, resin plastic rockery stone life in about 10 years.

Canada balsam: a viscous, yellowish, transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.