Our attempts to switch over to agroforestry of bamboo to substitute wood for our handicrafts took me to Institute Of Wood Science and Tech, IPRITI and NID Bangalore, where I had the pleasure of meeting some rare breed of “bamboo connoisseurs“. The 5 day seminar offered insights into novel methods of bamboo preservation and product development.
To a layman, bamboo epitomizes “a poor mans timber”- an ambivalent “pole“- being utilized in almost all rural activities- may it be construction, fencing, fishing or agriculture.
Why preserve bamboos?
Natural Untreated Bamboos are classified as GRADE 3 timber material. However, when properly treated it turns out be a very fine timber, in ways, stronger than steel and ALL HARDWOODS. In its treated state- Bamboo is classified as GRADE 1 Timber- along with Sagwan and Sal. Thus, treating bamboo becomes a necessity.
These techniques include non-chemical and chemical methods, some of which I have already discussed in one of my earlier blogs.
Sap Displacement, smoking, white-washing, storage in water.
Chemical treatment methods (CCA), Boric acid / Borax
Treatment in heated oil / oleo-heat-
I am intrigued by the simplicity and functionality of this process. Where-as, other processes may involve a time span of at least a few months, from the time of harvest to a fully dried and treated bamboo, the oil process renders a ready/treated and duly de-hydrated and de-starched bamboo, in a matter of hours!!! I am trying out various combinations– to study the costs involved, as well as to minimize chemical deterioration and the associated fire hazards.
Would appreciate comments/observations on this method .
Lacquer vs Varnish- Both lacquer and varnish are used to provide a finish to wooden furniture, but they are different in ingredients and how they are made.
Varnish is made from resins that are mixed with thinners or other solvents to remain liquid. On the other hand, lacquer is made by dissolving cotton and nitrocellulose in solvents.
• Varnish is always transparent, whereas lacquer can be made to give tinted finishes.
• No flattening agent is added in lacquer, whereas varnish can produce semi glossy and even satin finishes because of the presence of flattening agents.
• Lacquer being quick drying, it is applied mostly by spraying whereas varnish is applied using a brush.
Varnish is a resin(natural or synthetic) dissolved in oil and does not contain pigments. It produces hard film. Where as lacquers are quick drying coatings made of nitrocellulose dissolved in solvent with pigment added for color.