This article considers the material practices of forging ‘Hindu’ spaces in colonial India, through an examination of a cremation charity’s movement against a mechanical crematorium in interwar Calcutta. Established around 1926, the mechanical crematorium was advertised by the municipality as a cost-effective alternative to traditional Hindu pyres, disposing of unclaimed corpses and dissected parts by employing stigmatized Dalit labour, in a region of the city marked for ‘offensive’ trades. However, by 1932, a cremation charity led by municipal councillors and Indian capitalists contested the existence of the crematorium, arguing that its technological process, labour practices, and location were an affront to Hindu sensibilities. This article examines the rise of the charity and the decline of the crematorium within the context of electoral politics, the politics of the location, and the broader impact on interwar labour crises and famines in Calcutta. By analysing the anti-crematorium movement, this article offers a colonial material history of the construction of the emotional resonance in ‘Hindu spaces’ in India, outlining how it emerged at the interstices of communal and caste boundaries.