Gram stain test
A gram stain is performed to help identify whether unknown bacterial contaminants are gram-positive or negative to help narrow down the number of possible beer spoilers. The gram stain method uses crystal violet, iodine, 95% ethyl alcohol, and safranin to stain the bacterial cell wall. Gram-positive cells retain the crystal violet stain and turn violet, whereas the gram-negative cells retain the safranin stain and turn pink. Often used in conjunction with a catalase and oxidase test (see below).
Only logged in customers who have purchased this product may leave a review.