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3.- agregar al agua hirviendo unas gotas de colorante vegetal verde, que se vea bien oscuro, continuar hirviendo por unos 8 a 12 minutos.
add to the boiling water a few drops of green vegetable colorant until you see dark, continue boiling for about 8 to 12 minutes.
materias colorantes de origen vegetal y preparaciones a base de estas materias– ítulo
colouring matter of vegetable origin and preparations based thereon– g of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses or in forms or packings for retail sale
extractos curtientes de origen vegetal; taninos y sus derivados; materias 34320 colorantes de origen vegetal o animal
24.12.22 tanning extracts of vegetable origin; tannins and their derivatives; colouring matter of vegetable or animal origin
extractos curtientes de origen vegetal; taninos y sus sales, éteres, ésteres y demás derivados; materias colorantes de origen vegetal o animal
tanning extracts of vegetable origin; tannins and their salts, ethers, esters and other derivatives; colouring matter of vegetable or animal origin