Vaux's Law (as labelled by Avery & Idsardi 2001, Iverson & Salmons 2003), which he first formulated in a 1998 article in Linguistic Inquiry, states that laryngeally unspecified—i.e. voiceless--fricatives become GW/sg in systems contrasting fricatives without reference to GW/sg; thus they are to be aspirated or, more technically, to be pronounced with a spread glottis.
Retroflex consonant | Fricative consonant | consonant | click consonant | coronal consonant | Voiceless alveolar fricative | Voiced alveolar fricative | Uvular fricative | Tenuis consonant | stop consonant | High German consonant shift | Glottal consonant | Dorsal consonant | Coronal consonant | Click consonant |
In the dialects prevalent in much of eastern Bangladesh (Barisal, Chittagong, Dhaka and Sylhet divisions), many of the stops and affricates heard in Kolkata Bengali are pronounced as fricatives.