The lower layer of cells (the epidermis) was stripped from a lily leaf (with a steady hand!) and stained with Toluidine Blue. By viewing the stained epidermis using a polarised light microscope, the different cells present can be seen, including the guard cells which surround the stomata (mouth like structures which allow gaseous diffusion across the normally impermeable epidermis). The guard cells stain a slightly different colour due to the difference in the chemical structure of the cell walls.
These facemasks measuring 13 x 17.5cm have a full coverage print on their polyester front with a soft white cotton reverse. They come complete with 2 replaceable PM2.5 filters (8.5 x 12cm) that fit in a pouch between the outer and inner and soft elasticated ear loops (which come with rubber gromets to adjust for size but I normally just tie a loose knot in the elastic).
Please note that these are not medical grade masks but they are perfect for general use.
(Washing instructions - facemask machine wash at 40C, PM2.5 filter handwash. PM2.5 filter can be replaced with folded up kitchen roll.)
Supplied with a description of the image so you can show off to people who admire it!
Free UK delivery!
Delivery charges for overseas orders are calculated in the shopping basket.
Orders are normally sent out within 2 working days.