Snippets re. ink bottle RD 247945, registered by Henry Thacker and Company, New Street Square, London, on 22 November 1870 - Parcel 4; Class 3: glass.
New Street Square is on New Fetter Lane between Fleet Street and High Holborn in central London (postcode EC4 3LX), now completely redeveloped.
Photos below of a Thacker's Ink bottle bearing the registry date lozenge for 22 November 1870 - Parcel 4 (RD 247945), complete with original label, cork stopper, and dried remains of the original ink contents. (Permission to re-use these images on the GMB granted by kadok14). The bottle itself seems to be of clear glass, and I believe the type of bottle is often described as a 'tent' bottle.
Also photo of an empty very pale blue-green bottle (which the owner describes as 'aqua') which bears the registry date lozenge, and an empty cobalt example (the base simply embossed 'THACKER | LONDON). (Permission to re-use these images on the GMB granted by cockscomb).
There is a Thacker's Ink porcelain sign shown at
http://www.porcelainsigns.com/image-galleries/other-signs-t-z/thackers-ink-tablets-porcelain-sign/and photos of a lithographed Thacker's Ink Tiger Brand ink tablets tin at
http://www.ebay.com/itm/Vintage-Thackers-Ink-Tablets-Ad-Tiger-Brand-Litho-Tin-Box/361842392345It bears the instructions: "Important - Clean the ink pot thoroughly before use. Do not mix with any other ink. | Dissolve the tablet in an inkpot of water. About 144 tablets. | | Does not scratch the paper. Does not corrode the pen. Very smooth in writing. Very easily soluble. About 144 tablets."
1841 census: at John's Row, St Luke, Middlesex - Henry Thacker (5, b. Middlesex)), living with his mother, Jane Thacker (30-34, head of household), and his siblings - Hannah (11), Thomas (10), Robert (4) and Emma (2).
1851 census; at John's Row, St Luke, Middlesex -Henry Thacker,
junior clerk bookseller (15), still living with his mother (born Bromley, Kent) + 3 siblings, - Hannah(b. Bloomsbury), Thomas, and Emma.
1861 census: at Hemingford Road, Heminford Place, Islington - Henry Thacker (25, b. St Luke, Middlesex, about 1836,
bookseller, unmarried) living with his mother, Jane (head of household, 54, b. Kent) and sister, Emma (22, b. St Luke, Middlesex).
1871 census: at New Barnet, Chipping Barnet, Middlesex - Henry Thacker,
INK MANUFACTURER (34, head of household), living with his wife, Margaret A. Thacker (20, b. Corsham, Wiltshire) and his daughter, Fanny M. Thacker (0, b. Barnet, Hertfordshire).
Charles Henry Thacker, son of Henry Thacker and Margaret Anne Thacker, christened 5 November 1874, in the Parish of Holy Trinty, Lyonsdown, Hertfordshire.
Lilian Thyra Thacker, daughter of Henry Thacker and Margaret Anne Thacker, christened 5 November 1874, in the Parish of Holy Trinty, Lyonsdown, Hertfordshire.
1881 census: at Leicester Road, Chipping Barnet (Herts.), Middlesex - Henry Thacker,
INK MANUFACTURER, (45, head of household, b. St Luke, Middlesex), living with his wife, Margaret A. Thacker (38, b. Corsham, Wiltshire), his 4 children - Fanny M. (10), Lilian T. ,8, Charles H., (7), and Hilda K. (1) - all born in New Barnet, Hertfordshire, plus 1 female servant.
1891 census: at Ferme Park Road, Hornsey, Middlesex - Henry Thacker,
INK MANUFACTURER (55, head of household), living with his wife, Margaret A. Thacker - and his 3 children - Fanny M. (20), Lilian T., (18), and Charles H. (17).
1901 census: at Ferme Park Road, Hornsey, Middlesex - Henry Thacker,
WHOLESALE STATIONER, (62, head of household), living with his wife, Margaret A. Thatcher (50), his son, Charles H Thacker (27), plus 3 male boarders.
Fred.