...shake the bottle or pot several times each day, except the last, on which it must not be disturbed ; pour off the vinegar, so as to leave the chalk behind...to the bottom ; pour the water gently off, and wash the powder six or seven times, taking care always to make use of filtered water. When the powder is...

...to leave the chalk behind in the bottle, into which pour very clean water that has been,filtered ; throw the whole into a clean pan, and stir the water...to the bottom ; pour the water gently off, and wash the powder six or seven times, taking care always to make use of filtered water. When the powder is...

...disturbed. Pour off the vinegar, so as to leave the chalk behind in the bottle, into which pour very clear water that has been filtered. Throw the whole into...make use of filtered water. When the powder is as soft and as white as you could wish, dry it in a place where it is not exposed to dust ; sift it through...

...disturbed. Pour off the vinegar so as to leave the chalk behind in the bottle, into which pour very clear water that has been filtered. Throw the whole into...make use of filtered water. When the powder is as soft and as white as you could wish, dry it in a place where it is not exposed to dust ; sift it through...

...as to leave the chalk behind in the bottle, into which pour clean water that has been distilled or filtered ; throw the whole into a clean pan, and stir...spatula ; let the powder settle again to the bottom, then pour the water gently off, and wash the powder six or seven times, taking care always to use filtered...