Fir is also referred to as white or sil­ver fir because of the white to sil­very col­or of the bark. The wood col­or can vary from a yel­low­ish-white to red­dish-white, a bluish or grey-pur­ple glow can also appear. Under the influ­ence of light Fir wood dark­ens notice­ably and assumes a yel­low­ish-brown or aged tone. Fir wood is sim­i­lar to spruce in that it is cat­e­gorised as a soft­wood with high strength. The annu­al rings are clear­ly vis­i­ble. On the long sides it can show stripes or spades.