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It is the fir's Resin , dissolved in Essential Oil s, and is a Viscous , sticky, colourless (sometimes yellowish) liquid, that turns to a transparent yellowish mass when the essential oils have been allowed to evaporate.

Due to its high optical quality, its Refractive Index (''n'' = 1.55, very close to that of Glass ), and its purity it is mainly used in Optics as an invisible-when-dry Glue for glass. It is soluble in Xylene , Amorphous when dried, and it does not crystallize with age, so its optical properties do not deteriorate.

Some uses include:
  • in Biology to conserve Microscopic samples. The sample is sandwiched between the Microscope Slide (a glass plate) and the cover plate (a small thin glass plate) and Canada balsam is used to glue the arrangement together and enclose the sample to conserve it;

  • in optical technology to glue together optical elements such as two Prism s to form a Beam Splitter , or two Lenses ;

  • to fix scratches in Glass (car glass for instance) as invisibly as possible.

  • in oil painting to achieve glow and facilitate fusion.


Canada balsam is sometimes incorrectly called '' Balm Of Gilead ''. The true balsam is a fir tree; '' Balm Of Gilead '' is a type of poplar.