blacklead การใช้

• This wax mold was then blackened with very fine blacklead dust.
• Hantzsch and the entire crew found refuge on Blacklead Island.
• On 3 October 1835, J . S . Staedtler received permission from the municipal council to produce blacklead, red chalk and pastel pencils in his industrial plant.
• A resident of Cwmavon remembers that in the late 1920s No . 5 Forge Row was owned by Mr Llewellyn, the Sunday school superintendent, who ran the cottage as a small shop selling " household goods such as soap, scrubbing brushes and blacklead along with sweets, cigarettes and paraffin ".