MINERAL-SALT PRESERVATION OF LICHENS

Lichens preserved with glycerin composition are widely used in fl oristics, educational process, landscape layout. The disadvantage of glycerin preservation is the high fi re hazard. Mineral-salt compositions based on the most affordable and cheap reagents are proposed. Comparative results of crash tests of thalli impregnated with glycerin and solutions of mineral salts are presented. A comparison was made of preserving compositions based on glycerin and those based on mineral salts for fi re hazard. Lichens preserved with mineral-salt compositions showed high effi ciency according to the Technical Regulations on Fire safety requirements in terms of fl ame propagation (RP1). Mineral-salt preservation (stabilization) does not affect the perception of dyes by thallomas; The best results, both for conventional and fl uorescent coloring, were noted for lichen thallomas bleached in a solution of hydrogen peroxide, as well as for freshly collected samples. The addition of fl ame retardants to glycerin impregnation slightly reduces the fl ame propagation rate to RP3. An express method of mineral-salt preservation for lichens is proposed.