PLA is a direct set culture mix which contains Yeasts, B.Linen and Geo. 
It is used for aromatic ripening and complex rinds and can also be used to wash cheese. 
The Geo and Yeast deacidify the surface so that the B.Linen can grow on it. 
The yeast also produce aroma. If used in the milk (meaning not just in the wash/spray) 
the yeast produces aromatic properties that are the results of gas production when it dies off. 
If used in combination with bloomy cheese it may expose itself later after the PC have settled 
and show as orangy strikes below. If used for washing, expect it to produce a very light and 
rather faint orange color - this isn't the crazy orange B.Linen and doesn't smell or look 
like that strain. Don't over use it because it may eventually overwhelm the cheese quality.