and anionic polyacrylamide polymer groups in increasing the retention of pigment is further illustrated in the following examples example no 2 illustrates the preparation of a material at the starch plant which contains cationic starch and anionic polyacrylamide polymer and which is suitable for use in the process of this invention a cationic starch is prepared using the procedure of example no 1 the starch has a degree of substitution of 0 033 98 of the cationic starch material is mixed with 2 by weight polyacrylamide polymer of about 5 u00d7 10 6 average molecular weight the product of example no 2 is added to water and cooked with steam for 20 minutes at 195 u00b0 f to gelatinize the starch the cooked starch material is added to the headbox of a paper process as a wet end additive in an amount of 1 by weight based on the weight of wood pulp solids this means that 0 98 starch and 0 02 polyacrylamide polymer is added the headbox has a concentration of about 0 3 to 0 7 preferably about 0 5 by weight wood pulp table no i illustrates the improved pigment retention resulting from the addition of cationic starch and polyacrylamide polymer to papermaking pulp compared to the addition of cationic starch alone the handsheets were prepared according to previously described method b using rosin and alum the cationic starch was added at 1 by weight based on the dry pulp weight.