PRESERVATION OF DOUGLAS FIR NEEDLES

摘要

A solution and process for preserving Douglas Fir needles while preventing shedding thereof from the branch to which they are naturally attached, producing a natural looking product suitable for display purposes. The branches, with attached needles, are immersed in a solution comprising (in amounts per litre of solution): 300 - 500 ml water 200 - 300 ml ethyl alcohol 0 - 75 ml ethylene glycol 50 - 75 ml propionic acid 0 - 20 ml glycerin 100 - 150 ml formalin 50 - 175 ml propylene glycol 40 - 75 gms citric acid 1 - 7 gms magnesium sulphate 15 - 25 gms cupric sulphate 5 - 10 gms sodium sulphite 0 - 10 gms seaweed extract, for a period of up to about two weeks and subsequently air dried.