Does preserving tradition mean continuing to use the same tools? Maruhachi Seichajo’s history describes searching for a new method to retain the taste of sand roasting. A report on tea finishing machinery, meanwhile, records a design combining far-infrared heat and hot air. Rather than forcing the two records into a one-way story from old tools to new, let us read them through the problems they sought to solve.
The aim was to preserve the taste, rather than the sand
According to Maruhachi Seichajo’s history, during the Showa 40s (1965-1974), as concern about food safety increased, the company explored a roasting method that would retain the taste of sand roasting without sand getting into the tea. The goal was more than simply eliminating sand or keeping old tools.
The account contains both something to retain and something to change: preserve the taste while reducing the possibility of sand contamination. Reading the change as a way to preserve something, rather than simply improve efficiency, makes the merchant’s challenge clearer.
Far-infrared heat from above, hot air from below
A 1988 report from the Japanese Society of Tea Science describes a far-infrared finishing machine developed by Shizuoka Kikai Seisakusho. It has far-infrared heaters above a trough conveyor and sends hot air from below. Two ways of delivering heat are combined in one machine.
Treating far-infrared and hot air as an either-or choice makes this structure easy to miss. Picturing the material conveyor and the heating above and below separately gives a clearer spatial understanding of the machine. The report, however, concerns the finishing heat treatment of green tea, not a hojicha production test.
Do not turn the two records into a single lineage
Maruhachi Seichajo’s history and the 1988 test report document separate efforts. These two records alone do not establish that one technology passed directly into the other. Connecting similar terms or chronological order as if they proved causation can easily turn technological history into a different story.
Here, 1988 is also the year the report was published. It is not necessarily the year of development or release. Distinguishing when something was recorded from when it originated clarifies what an old document can tell us.
Look at the problem an old tool solved
Keeping the taste while preventing sand contamination; combining two heating methods in one machine. Seen through their problems, roasting history is more than a chronological list of equipment names. It is also a record of decisions about what to change and what to retain.
Next time you read a tea merchant’s history or a roaster’s explanation, look for three things: the earlier difficulty, the mechanism that changed, and the taste someone wanted to preserve. You may find previously unexplained background to a production method named on a bag today.