The 1/2d Vermilion (S.G. 197/K27) is known with the PEARS' SOAP. underprint in outline letters in three colours, orange, mauve and blue. Examples of all three are shown below:
This stamp is also known with the words USE PEARS SOAP. in solid red letters, as shown below:
As a trial for the above advertisements a printing was also made with the words "Half Penny" in two lines in black under the gum. This is very similar to the "One Penny" underprint on the 1d Lilac.
Note. The above stamp has a Stanley Gibbons Specialised catalogue number of K27 with the Pears Soap underprint being variety K27m, the USE PEARS SOAP. underprint being K27o and the Half Penny underprint being K27p.