I noticed this small cardboard box being used by my mom, an octogenarian, to preserve a valuable memory of hers from a long time ago. The box is of W & R Balston Ltd’s Whatman Filter Paper No.1, Made in England.

Searching online I learned that:

  1. the design of the box was from the 1950s or earlier;
  2. the filter papers were mostly used in chemical processes (maybe we used it when my family #LIFCOBOOKS owned a book printing press in North Arcot District in the 1950s);
  3. there are many grades of the filter paper each with a unique number to identify the Particle retention capabilities and the thickness.
W & R Balston Ltd Whatman Filter Paper No 1 Made in England box

W & R Balston Ltd Whatman Filter Paper No 1 Made in England box

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