Toner and two-component developer

A toner, comprising:

• a toner particle;
• and
• silica fine particle A on a surface of the toner particle, silica fine particle A having a compound with a siloxane structure at a surface thereof;
• the toner having a weight average particle diameter of 4.0 to 15.0 μm;
• and
• a carbon loss ratio when the silica fine particle A is washed with hexane being 5 to 70%, wherein
• a temperature at which a differential coefficient of a nine-point moving average of integrated values integrated from 35° C. reaches 4000 or more for an intensity of an obtained ion having a mass number (M/z) of 207 is 270° C. or higher, when mass spectrometry is carried out at a sampling interval of 0.4 seconds while heating the silica fine particle A as described below
• (i) 7.0 mg of the silica fine particle A is heated from 35° C. at a temperature increase rate of 20° C./min in a nitrogen atmosphere,
• (ii) gas generated as a temperature increased is ionized at an ionization current of 50 μA and an ionization energy of 70 eV, and
• (iii) components contained in the ionized gas are subjected to mass spectrometry at an EM voltage of 1000 V using a quadrupole mass spectrometer.