Is this Proteus Vulgaris or P. Mirabilis?
P. vulgaris is indole positive.P. Mirablis is indole negative. P. mirabilis produces hydrogen sulfide gas, a very distinct odor. If you have a bunch of bubbles, I would guess it’s P. mirabilis A positive indole result is shown by the presence of a red or red-violet color in the surface alcohol layer of the broth. A negative result appears yellow. A variable result can also occur, showing an orange color as a result. This is due to the presence of skatole, also known as methyl indole or methylated indole, another possible product of tryptophan degradation. You probably contaminated your test. Good luck.
